28449720 has 96 divisors (see below), whose sum is σ = 99590400. Its totient is φ = 7001856.

The previous prime is 28449719. The next prime is 28449727. The reversal of 28449720 is 2794482.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28449727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1641 + ... + 7719.

It is an arithmetic number, because the mean of its divisors is an integer number (1037400).

Almost surely, 2^28449720 is an apocalyptic number.

28449720 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 28449720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49795200).

28449720 is an abundant number, since it is smaller than the sum of its proper divisors (71140680).

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

28449720 is a wasteful number, since it uses less digits than its factorization.

28449720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6109 (or 6102 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 28449720 is about 5333.8278937364. The cubic root of 28449720 is about 305.2760020672.

The spelling of 28449720 in words is "twenty-eight million, four hundred forty-nine thousand, seven hundred twenty".