28077625566 has 16 divisors (see below), whose sum is σ = 62394723600. Its totient is φ = 9359208504.

The previous prime is 28077625553. The next prime is 28077625601. The reversal of 28077625566 is 66552677082.

28077625566 is a `hidden beast` number, since 2 + 8 + 0 + 7 + 7 + 625 + 5 + 6 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 519956029 = 28077625566 / (2 + 8 + 0 + 7 + 7 + 6 + 2 + 5 + 5 + 6 + 6).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259977961 + ... + 259978068.

It is an arithmetic number, because the mean of its divisors is an integer number (3899670225).

Almost surely, 2^28077625566 is an apocalyptic number.

28077625566 is an abundant number, since it is smaller than the sum of its proper divisors (34317098034).

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

28077625566 is a wasteful number, since it uses less digits than its factorization.

28077625566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519956040 (or 519956034 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 54.

The spelling of 28077625566 in words is "twenty-eight billion, seventy-seven million, six hundred twenty-five thousand, five hundred sixty-six".