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28449900 = 22335241257
BaseRepresentation
bin110110010000…
…1110001101100
31222112101221000
41230201301230
524240344100
62453440300
7463551213
oct154416154
958471830
1028449900
1115071916
129640090
135b8157b
143ac807a
15276e900
hex1b21c6c

28449900 has 144 divisors (see below), whose sum is σ = 94056480. Its totient is φ = 7372800.

The previous prime is 28449893. The next prime is 28449907. The reversal of 28449900 is 994482.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28449893) and next prime (28449907).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28449907) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 110572 + ... + 110828.

It is an arithmetic number, because the mean of its divisors is an integer number (653170).

Almost surely, 228449900 is an apocalyptic number.

28449900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28449900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47028240).

28449900 is an abundant number, since it is smaller than the sum of its proper divisors (65606580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28449900 is a wasteful number, since it uses less digits than its factorization.

28449900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 28449900 is about 5333.8447671450. The cubic root of 28449900 is about 305.2766458880.

The spelling of 28449900 in words is "twenty-eight million, four hundred forty-nine thousand, nine hundred".