2640312279 has 96 divisors (see below), whose sum is σ = 4658135040. Its totient is φ = 1421952000.

The previous prime is 2640312277. The next prime is 2640312307. The reversal of 2640312279 is 9722130462.

2640312279 is a `hidden beast` number, since 2 + 640 + 3 + 1 + 2 + 2 + 7 + 9 = 666.

It is not a de Polignac number, because 2640312279 - 2¹ = 2640312277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640312271) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2293354 + ... + 2294504.

It is an arithmetic number, because the mean of its divisors is an integer number (48522240).

Almost surely, 2^2640312279 is an apocalyptic number.

2640312279 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2640312279 is a deficient number, since it is larger than the sum of its proper divisors (2017822761).

2640312279 is a wasteful number, since it uses less digits than its factorization.

2640312279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261 (or 1258 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 2640312279 is about 51383.9690856983. The cubic root of 2640312279 is about 1382.1391382996.

The spelling of 2640312279 in words is "two billion, six hundred forty million, three hundred twelve thousand, two hundred seventy-nine".