2640687790 has 16 divisors (see below), whose sum is σ = 5118871968. Its totient is φ = 975023136.

The previous prime is 2640687781. The next prime is 2640687793. The reversal of 2640687790 is 977860462.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640687793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10156362 + ... + 10156621.

It is an arithmetic number, because the mean of its divisors is an integer number (319929498).

Almost surely, 2^2640687790 is an apocalyptic number.

2640687790 is a deficient number, since it is larger than the sum of its proper divisors (2478184178).

2640687790 is a wasteful number, since it uses less digits than its factorization.

2640687790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20313003.

The product of its (nonzero) digits is 1016064, while the sum is 49.

The square root of 2640687790 is about 51387.6229261483. The cubic root of 2640687790 is about 1382.2046588128.

The spelling of 2640687790 in words is "two billion, six hundred forty million, six hundred eighty-seven thousand, seven hundred ninety".