28325870815564 has 48 divisors (see below), whose sum is σ = 59672670668800. Its totient is φ = 11748057002640.

The previous prime is 28325870815549. The next prime is 28325870815631. The reversal of 28325870815564 is 46551807852382.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28325870815496 and 28325870815505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332952282 + ... + 333037345.

Almost surely, 2^{28325870815564} is an apocalyptic number.

It is an amenable number.

28325870815564 is an abundant number, since it is smaller than the sum of its proper divisors (31346799853236).

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

28325870815564 is a wasteful number, since it uses less digits than its factorization.

28325870815564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665989683 (or 665989667 counting only the distinct ones).

The product of its (nonzero) digits is 129024000, while the sum is 64.

The spelling of 28325870815564 in words is "twenty-eight trillion, three hundred twenty-five billion, eight hundred seventy million, eight hundred fifteen thousand, five hundred sixty-four".