87765013 has 16 divisors (see below), whose sum is σ = 101687040. Its totient is φ = 74198016.

The previous prime is 87764993. The next prime is 87765019. The reversal of 87765013 is 31056778.

It is a cyclic number.

It is not a de Polignac number, because 87765013 - 2²⁵ = 54210581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87765019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225423 + ... + 225811.

It is an arithmetic number, because the mean of its divisors is an integer number (6355440).

Almost surely, 2^87765013 is an apocalyptic number.

It is an amenable number.

87765013 is a deficient number, since it is larger than the sum of its proper divisors (13922027).

87765013 is a wasteful number, since it uses less digits than its factorization.

87765013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 87765013 is about 9368.2982979835. The cubic root of 87765013 is about 444.3997512396.

The spelling of 87765013 in words is "eighty-seven million, seven hundred sixty-five thousand, thirteen".