28743904 has 24 divisors (see below), whose sum is σ = 64674288. Its totient is φ = 12318720.

The previous prime is 28743887. The next prime is 28743919. The reversal of 28743904 is 40934782.

It is a happy number.

It is a super-2 number, since 2×28743904² = 1652424034322432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63937 + ... + 64384.

It is an arithmetic number, because the mean of its divisors is an integer number (2694762).

Almost surely, 2^28743904 is an apocalyptic number.

It is an amenable number.

28743904 is an abundant number, since it is smaller than the sum of its proper divisors (35930384).

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

28743904 is a wasteful number, since it uses less digits than its factorization.

28743904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128338 (or 128330 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 28743904 is about 5361.3341623145. The cubic root of 28743904 is about 306.3246302084.

The spelling of 28743904 in words is "twenty-eight million, seven hundred forty-three thousand, nine hundred four".