28720750392 has 32 divisors (see below), whose sum is σ = 79779862800. Its totient is φ = 9573583392.

The previous prime is 28720750369. The next prime is 28720750423. The reversal of 28720750392 is 29305702782.

28720750392 is a `hidden beast` number, since 2 + 8 + 7 + 207 + 50 + 392 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66483003 + ... + 66483434.

Almost surely, 2^28720750392 is an apocalyptic number.

It is an amenable number.

28720750392 is an abundant number, since it is smaller than the sum of its proper divisors (51059112408).

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

28720750392 is a wasteful number, since it uses less digits than its factorization.

28720750392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132966452 (or 132966442 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 28720750392 in words is "twenty-eight billion, seven hundred twenty million, seven hundred fifty thousand, three hundred ninety-two".