28744992 has 36 divisors (see below), whose sum is σ = 81744390. Its totient is φ = 9581568.

The previous prime is 28744957. The next prime is 28744993. The reversal of 28744992 is 29944782.

It can be written as a sum of positive squares in only one way, i.e., 27499536 + 1245456 = 5244^2 + 1116^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (28744993) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49617 + ... + 50192.

Almost surely, 2^28744992 is an apocalyptic number.

It is an amenable number.

28744992 is an abundant number, since it is smaller than the sum of its proper divisors (52999398).

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

28744992 is a wasteful number, since it uses less digits than its factorization.

28744992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99825 (or 99814 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 28744992 is about 5361.4356286353. The cubic root of 28744992 is about 306.3284951089.

The spelling of 28744992 in words is "twenty-eight million, seven hundred forty-four thousand, nine hundred ninety-two".