28561511663087 has 64 divisors (see below), whose sum is σ = 32137769220480. Its totient is φ = 25210812211200.

The previous prime is 28561511663071. The next prime is 28561511663119. The reversal of 28561511663087 is 78036611516582.

It is a cyclic number.

It is not a de Polignac number, because 28561511663087 - 2⁴ = 28561511663071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28561511603087) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9330776537 + ... + 9330779597.

It is an arithmetic number, because the mean of its divisors is an integer number (502152644070).

Almost surely, 2^{28561511663087} is an apocalyptic number.

28561511663087 is a deficient number, since it is larger than the sum of its proper divisors (3576257557393).

28561511663087 is a wasteful number, since it uses less digits than its factorization.

28561511663087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4444.

The product of its (nonzero) digits is 14515200, while the sum is 59.

The spelling of 28561511663087 in words is "twenty-eight trillion, five hundred sixty-one billion, five hundred eleven million, six hundred sixty-three thousand, eighty-seven".