28857431430 has 24 divisors (see below), whose sum is σ = 75029321952. Its totient is φ = 7695315024.

The previous prime is 28857431429. The next prime is 28857431461. The reversal of 28857431430 is 3413475882.

28857431430 is a `hidden beast` number, since 2 + 8 + 8 + 574 + 31 + 43 + 0 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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, 160318974 + ... + 160319153.

It is an arithmetic number, because the mean of its divisors is an integer number (3126221748).

Almost surely, 2^28857431430 is an apocalyptic number.

28857431430 is an abundant number, since it is smaller than the sum of its proper divisors (46171890522).

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

28857431430 is a wasteful number, since it uses less digits than its factorization.

28857431430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320638140 (or 320638137 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The spelling of 28857431430 in words is "twenty-eight billion, eight hundred fifty-seven million, four hundred thirty-one thousand, four hundred thirty".