28857621996 has 36 divisors (see below), whose sum is σ = 83366464272. Its totient is φ = 8245034784.

The previous prime is 28857621967. The next prime is 28857622007. The reversal of 28857621996 is 69912675882.

28857621996 is a `hidden beast` number, since 288 + 57 + 6 + 219 + 96 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57256935 + ... + 57257438.

Almost surely, 2^28857621996 is an apocalyptic number.

It is an amenable number.

28857621996 is an abundant number, since it is smaller than the sum of its proper divisors (54508842276).

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

28857621996 is a wasteful number, since it uses less digits than its factorization.

28857621996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114514390 (or 114514385 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 63.

The spelling of 28857621996 in words is "twenty-eight billion, eight hundred fifty-seven million, six hundred twenty-one thousand, nine hundred ninety-six".