28449990 has 48 divisors (see below), whose sum is σ = 74297808. Its totient is φ = 7553088.

The previous prime is 28449989. The next prime is 28449991. The reversal of 28449990 is 9994482.

It is an interprime number because it is at equal distance from previous prime (28449989) and next prime (28449991).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28449991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24912 + ... + 26028.

It is an arithmetic number, because the mean of its divisors is an integer number (1547871).

Almost surely, 2^28449990 is an apocalyptic number.

28449990 is an abundant number, since it is smaller than the sum of its proper divisors (45847818).

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

28449990 is a wasteful number, since it uses less digits than its factorization.

28449990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1413 (or 1410 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 28449990 is about 5333.8532038293. The cubic root of 28449990 is about 305.2769677973.

The spelling of 28449990 in words is "twenty-eight million, four hundred forty-nine thousand, nine hundred ninety".