2636640742 has 24 divisors (see below), whose sum is σ = 4147433640. Its totient is φ = 1257025440.

The previous prime is 2636640731. The next prime is 2636640781. The reversal of 2636640742 is 2470466362.

It is a junction number, because it is equal to n+sod(n) for n = 2636640695 and 2636640704.

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 11 ways as a sum of consecutive naturals, for example, 346434 + ... + 353962.

It is an arithmetic number, because the mean of its divisors is an integer number (172809735).

Almost surely, 2^2636640742 is an apocalyptic number.

2636640742 is a deficient number, since it is larger than the sum of its proper divisors (1510792898).

2636640742 is a wasteful number, since it uses less digits than its factorization.

2636640742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7908 (or 7885 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 40.

The square root of 2636640742 is about 51348.2301739797. The cubic root of 2636640742 is about 1381.4981877288.

The spelling of 2636640742 in words is "two billion, six hundred thirty-six million, six hundred forty thousand, seven hundred forty-two".