2640926686 has 16 divisors (see below), whose sum is σ = 4064927328. Its totient is φ = 1286060800.

The previous prime is 2640926647. The next prime is 2640926713. The reversal of 2640926686 is 6866290462.

It is a happy number.

It is a congruent number.

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, 21471 + ... + 75781.

It is an arithmetic number, because the mean of its divisors is an integer number (254057958).

Almost surely, 2^2640926686 is an apocalyptic number.

2640926686 is a deficient number, since it is larger than the sum of its proper divisors (1424000642).

2640926686 is a wasteful number, since it uses less digits than its factorization.

2640926686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54947.

The product of its (nonzero) digits is 1492992, while the sum is 49.

The square root of 2640926686 is about 51389.9473243552. The cubic root of 2640926686 is about 1382.2463390155.

The spelling of 2640926686 in words is "two billion, six hundred forty million, nine hundred twenty-six thousand, six hundred eighty-six".