28990704 has 40 divisors (see below), whose sum is σ = 77312512. Its totient is φ = 9351360.

The previous prime is 28990667. The next prime is 28990711. The reversal of 28990704 is 40709982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8254 + ... + 11229.

Almost surely, 2^28990704 is an apocalyptic number.

28990704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28990704 is an abundant number, since it is smaller than the sum of its proper divisors (48321808).

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

28990704 is a wasteful number, since it uses less digits than its factorization.

28990704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19525 (or 19519 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 28990704 is about 5384.3016260236. The cubic root of 28990704 is about 307.1988511784.

The spelling of 28990704 in words is "twenty-eight million, nine hundred ninety thousand, seven hundred four".