28407857664 has 80 divisors (see below), whose sum is σ = 76460918688. Its totient is φ = 9371615232.

The previous prime is 28407857651. The next prime is 28407857707. The reversal of 28407857664 is 46675870482.

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, 53659 + ... + 244325.

Almost surely, 2^28407857664 is an apocalyptic number.

28407857664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28407857664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38230459344).

28407857664 is an abundant number, since it is smaller than the sum of its proper divisors (48053061024).

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

28407857664 is an equidigital number, since it uses as much as digits as its factorization.

28407857664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190785 (or 190769 counting only the distinct ones).

The product of its (nonzero) digits is 18063360, while the sum is 57.

The spelling of 28407857664 in words is "twenty-eight billion, four hundred seven million, eight hundred fifty-seven thousand, six hundred sixty-four".