2640277686 has 32 divisors (see below), whose sum is σ = 5529835008. Its totient is φ = 838819520.

The previous prime is 2640277637. The next prime is 2640277691. The reversal of 2640277686 is 6867720462.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4735 + ... + 72821.

It is an arithmetic number, because the mean of its divisors is an integer number (172807344).

Almost surely, 2^2640277686 is an apocalyptic number.

2640277686 is an abundant number, since it is smaller than the sum of its proper divisors (2889557322).

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

2640277686 is a wasteful number, since it uses less digits than its factorization.

2640277686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68396.

The product of its (nonzero) digits is 1354752, while the sum is 48.

The square root of 2640277686 is about 51383.6324718290. The cubic root of 2640277686 is about 1382.1331020757.

The spelling of 2640277686 in words is "two billion, six hundred forty million, two hundred seventy-seven thousand, six hundred eighty-six".