64515940 has 24 divisors (see below), whose sum is σ = 137342520. Its totient is φ = 25452288.

The previous prime is 64515917. The next prime is 64515973. The reversal of 64515940 is 4951546.

It can be written as a sum of positive squares in 4 ways, for example, as 2916 + 64513024 = 54^2 + 8032^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64515896 and 64515905.

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, 20635 + ... + 23554.

It is an arithmetic number, because the mean of its divisors is an integer number (5722605).

Almost surely, 2^64515940 is an apocalyptic number.

It is an amenable number.

64515940 is an abundant number, since it is smaller than the sum of its proper divisors (72826580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64515940 is a wasteful number, since it uses less digits than its factorization.

64515940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44271 (or 44269 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 64515940 is about 8032.1815218532. The cubic root of 64515940 is about 401.0719994763.

The spelling of 64515940 in words is "sixty-four million, five hundred fifteen thousand, nine hundred forty".