91870564 has 12 divisors (see below), whose sum is σ = 161181244. Its totient is φ = 45818784.

The previous prime is 91870547. The next prime is 91870589. The reversal of 91870564 is 46507819.

91870564 = 1945² + 1946² + ... + 1968².

It can be written as a sum of positive squares in 2 ways, for example, as 33988900 + 57881664 = 5830^2 + 7608^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27339 + ... + 30514.

Almost surely, 2^91870564 is an apocalyptic number.

It is an amenable number.

91870564 is a deficient number, since it is larger than the sum of its proper divisors (69310680).

91870564 is a wasteful number, since it uses less digits than its factorization.

91870564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58254 (or 58252 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 91870564 is about 9584.9133538076. The cubic root of 91870564 is about 451.2239339051.

The spelling of 91870564 in words is "ninety-one million, eight hundred seventy thousand, five hundred sixty-four".