28907984 has 20 divisors (see below), whose sum is σ = 64010784. Its totient is φ = 12389088.

The previous prime is 28907951. The next prime is 28908013. The reversal of 28907984 is 48970982.

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, 128942 + ... + 129165.

Almost surely, 2^28907984 is an apocalyptic number.

It is an amenable number.

28907984 is an abundant number, since it is smaller than the sum of its proper divisors (35102800).

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

28907984 is a wasteful number, since it uses less digits than its factorization.

28907984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258122 (or 258116 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 28907984 is about 5376.6145482078. The cubic root of 28907984 is about 306.9063931033.

The spelling of 28907984 in words is "twenty-eight million, nine hundred seven thousand, nine hundred eighty-four".