87312765 has 32 divisors (see below), whose sum is σ = 153031680. Its totient is φ = 42312704.

The previous prime is 87312737. The next prime is 87312779. The reversal of 87312765 is 56721378.

It is a cyclic number.

It is not a de Polignac number, because 87312765 - 2⁸ = 87312509 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1492 + ... + 13298.

It is an arithmetic number, because the mean of its divisors is an integer number (4782240).

Almost surely, 2^87312765 is an apocalyptic number.

87312765 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

87312765 is a deficient number, since it is larger than the sum of its proper divisors (65718915).

87312765 is a wasteful number, since it uses less digits than its factorization.

87312765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11861.

The product of its digits is 70560, while the sum is 39.

The square root of 87312765 is about 9344.1299755515. The cubic root of 87312765 is about 443.6351143442.

The spelling of 87312765 in words is "eighty-seven million, three hundred twelve thousand, seven hundred sixty-five".