2640642994 has 32 divisors (see below), whose sum is σ = 4435041600. Its totient is φ = 1169034240.

The previous prime is 2640642959. The next prime is 2640643003. The reversal of 2640642994 is 4992460462.

It is a super-2 number, since 2×2640642994² = 13945990843522568072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121122 + ... + 141250.

It is an arithmetic number, because the mean of its divisors is an integer number (138595050).

Almost surely, 2^2640642994 is an apocalyptic number.

2640642994 is a deficient number, since it is larger than the sum of its proper divisors (1794398606).

2640642994 is a wasteful number, since it uses less digits than its factorization.

2640642994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20298.

The product of its (nonzero) digits is 746496, while the sum is 46.

The square root of 2640642994 is about 51387.1870605893. The cubic root of 2640642994 is about 1382.1968429715.

The spelling of 2640642994 in words is "two billion, six hundred forty million, six hundred forty-two thousand, nine hundred ninety-four".