28088686664 has 16 divisors (see below), whose sum is σ = 52748459820. Its totient is φ = 14022430720.

The previous prime is 28088686663. The next prime is 28088686667. The reversal of 28088686664 is 46668688082.

It can be written as a sum of positive squares in 2 ways, for example, as 25167284164 + 2921402500 = 158642^2 + 54050^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28088686597 and 28088686606.

It is not an unprimeable number, because it can be changed into a prime (28088686663) 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, 2733629 + ... + 2743884.

Almost surely, 2^28088686664 is an apocalyptic number.

It is an amenable number.

28088686664 is a deficient number, since it is larger than the sum of its proper divisors (24659773156).

28088686664 is a wasteful number, since it uses less digits than its factorization.

28088686664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5478160 (or 5478156 counting only the distinct ones).

The product of its (nonzero) digits is 42467328, while the sum is 62.

The spelling of 28088686664 in words is "twenty-eight billion, eighty-eight million, six hundred eighty-six thousand, six hundred sixty-four".