87311645 has 8 divisors (see below), whose sum is σ = 105086904. Its totient is φ = 69640704.

The previous prime is 87311633. The next prime is 87311659. The reversal of 87311645 is 54611378.

It can be written as a sum of positive squares in 4 ways, for example, as 1582564 + 85729081 = 1258^2 + 9259^2 .

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 87311645 - 2²² = 83117341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24224 + ... + 27593.

It is an arithmetic number, because the mean of its divisors is an integer number (13135863).

Almost surely, 2^87311645 is an apocalyptic number.

It is an amenable number.

87311645 is a deficient number, since it is larger than the sum of its proper divisors (17775259).

87311645 is a wasteful number, since it uses less digits than its factorization.

87311645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52159.

The product of its digits is 20160, while the sum is 35.

The square root of 87311645 is about 9344.0700446861. The cubic root of 87311645 is about 443.6332174338.

The spelling of 87311645 in words is "eighty-seven million, three hundred eleven thousand, six hundred forty-five".