10640639 has 2 divisors, whose sum is σ = 10640640. Its totient is φ = 10640638.

The previous prime is 10640633. The next prime is 10640647. The reversal of 10640639 is 93604601.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10640639 is a prime.

It is a super-2 number, since 2×10640639² = 226446396656642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10640633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5320319 + 5320320.

It is an arithmetic number, because the mean of its divisors is an integer number (5320320).

Almost surely, 2^10640639 is an apocalyptic number.

10640639 is a deficient number, since it is larger than the sum of its proper divisors (1).

10640639 is an equidigital number, since it uses as much as digits as its factorization.

10640639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 10640639 is about 3261.9992335989. Note that the first 3 decimals coincide. The cubic root of 10640639 is about 219.9492927212.

The spelling of 10640639 in words is "ten million, six hundred forty thousand, six hundred thirty-nine".