2640660264 has 80 divisors (see below), whose sum is σ = 8068705920. Its totient is φ = 800197920.

The previous prime is 2640660263. The next prime is 2640660271. The reversal of 2640660264 is 4620660462.

2640660264 is a `hidden beast` number, since 2 + 6 + 40 + 6 + 602 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (2640660263) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 178104 + ... + 192359.

It is an arithmetic number, because the mean of its divisors is an integer number (100858824).

Almost surely, 2^2640660264 is an apocalyptic number.

2640660264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2640660264 is an abundant number, since it is smaller than the sum of its proper divisors (5428045656).

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

2640660264 is a wasteful number, since it uses less digits than its factorization.

2640660264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370492 (or 370479 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 2640660264 is about 51387.3550983119. The cubic root of 2640660264 is about 1382.1998561881.

The spelling of 2640660264 in words is "two billion, six hundred forty million, six hundred sixty thousand, two hundred sixty-four".