28857774320 has 40 divisors (see below), whose sum is σ = 70011474336. Its totient is φ = 11041234688.

The previous prime is 28857774301. The next prime is 28857774373. The reversal of 28857774320 is 2347775882.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×28857774320² (a number of 22 digits) contains 22 as substring.

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, 7839947 + ... + 7843626.

Almost surely, 2^28857774320 is an apocalyptic number.

28857774320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28857774320 is an abundant number, since it is smaller than the sum of its proper divisors (41153700016).

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

28857774320 is a wasteful number, since it uses less digits than its factorization.

28857774320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15683609 (or 15683603 counting only the distinct ones).

The product of its (nonzero) digits is 5268480, while the sum is 53.

The spelling of 28857774320 in words is "twenty-eight billion, eight hundred fifty-seven million, seven hundred seventy-four thousand, three hundred twenty".