28799631920 has 20 divisors (see below), whose sum is σ = 66959144400. Its totient is φ = 11519852736.

The previous prime is 28799631899. The next prime is 28799631923. The reversal of 28799631920 is 2913699782.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (28799631923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179997620 + ... + 179997779.

It is an arithmetic number, because the mean of its divisors is an integer number (3347957220).

Almost surely, 2^28799631920 is an apocalyptic number.

28799631920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28799631920 is an abundant number, since it is smaller than the sum of its proper divisors (38159512480).

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

28799631920 is a wasteful number, since it uses less digits than its factorization.

28799631920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359995412 (or 359995406 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 56.

The spelling of 28799631920 in words is "twenty-eight billion, seven hundred ninety-nine million, six hundred thirty-one thousand, nine hundred twenty".