87091265 has 8 divisors (see below), whose sum is σ = 104780520. Its totient is φ = 69492352.

The previous prime is 87091261. The next prime is 87091267. The reversal of 87091265 is 56219078.

It can be written as a sum of positive squares in 4 ways, for example, as 19998784 + 67092481 = 4472^2 + 8191^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87091265 - 2² = 87091261 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87091261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20444 + ... + 24333.

It is an arithmetic number, because the mean of its divisors is an integer number (13097565).

Almost surely, 2^87091265 is an apocalyptic number.

It is an amenable number.

87091265 is a deficient number, since it is larger than the sum of its proper divisors (17689255).

87091265 is a wasteful number, since it uses less digits than its factorization.

87091265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45171.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 87091265 is about 9332.2700882476. The cubic root of 87091265 is about 443.2596503822.

The spelling of 87091265 in words is "eighty-seven million, ninety-one thousand, two hundred sixty-five".