28515692308 has 6 divisors (see below), whose sum is σ = 49902461546. Its totient is φ = 14257846152.

The previous prime is 28515692297. The next prime is 28515692323. The reversal of 28515692308 is 80329651582.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17431392784 + 11084299524 = 132028^2 + 105282^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3564461535 + ... + 3564461542.

Almost surely, 2^28515692308 is an apocalyptic number.

It is an amenable number.

28515692308 is a deficient number, since it is larger than the sum of its proper divisors (21386769238).

28515692308 is a wasteful number, since it uses less digits than its factorization.

28515692308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7128923081 (or 7128923079 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 28515692308 in words is "twenty-eight billion, five hundred fifteen million, six hundred ninety-two thousand, three hundred eight".