2640779626 has 32 divisors (see below), whose sum is σ = 4271496768. Its totient is φ = 1220002560.

The previous prime is 2640779623. The next prime is 2640779627. The reversal of 2640779626 is 6269770462.

It is a self number, because there is not a number n which added to its sum of digits gives 2640779626.

It is not an unprimeable number, because it can be changed into a prime (2640779623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 457116 + ... + 462856.

It is an arithmetic number, because the mean of its divisors is an integer number (133484274).

Almost surely, 2^2640779626 is an apocalyptic number.

2640779626 is a deficient number, since it is larger than the sum of its proper divisors (1630717142).

2640779626 is a wasteful number, since it uses less digits than its factorization.

2640779626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6006.

The product of its (nonzero) digits is 1524096, while the sum is 49.

The square root of 2640779626 is about 51388.5164798518. The cubic root of 2640779626 is about 1382.2206817439.

The spelling of 2640779626 in words is "two billion, six hundred forty million, seven hundred seventy-nine thousand, six hundred twenty-six".