28895405864 has 16 divisors (see below), whose sum is σ = 58346492820. Its totient is φ = 13336341120.

The previous prime is 28895405813. The next prime is 28895405867. The reversal of 28895405864 is 46850459882.

It can be written as a sum of positive squares in 2 ways, for example, as 28042181764 + 853224100 = 167458^2 + 29210^2 .

It is not an unprimeable number, because it can be changed into a prime (28895405867) 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, 138920117 + ... + 138920324.

Almost surely, 2^28895405864 is an apocalyptic number.

It is an amenable number.

28895405864 is an abundant number, since it is smaller than the sum of its proper divisors (29451086956).

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

28895405864 is a wasteful number, since it uses less digits than its factorization.

28895405864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277840460 (or 277840456 counting only the distinct ones).

The product of its (nonzero) digits is 22118400, while the sum is 59.

The spelling of 28895405864 in words is "twenty-eight billion, eight hundred ninety-five million, four hundred five thousand, eight hundred sixty-four".