1207664639 has 4 divisors (see below), whose sum is σ = 1207788120. Its totient is φ = 1207541160.

The previous prime is 1207664621. The next prime is 1207664651. The reversal of 1207664639 is 9364667021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1207664639 - 2⁸ = 1207664383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1207664639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1207664669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45677 + ... + 67094.

It is an arithmetic number, because the mean of its divisors is an integer number (301947030).

Almost surely, 2^1207664639 is an apocalyptic number.

1207664639 is a deficient number, since it is larger than the sum of its proper divisors (123481).

1207664639 is a wasteful number, since it uses less digits than its factorization.

1207664639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123480.

The product of its (nonzero) digits is 326592, while the sum is 44.

The square root of 1207664639 is about 34751.4695948243. The cubic root of 1207664639 is about 1064.9162398952.

The spelling of 1207664639 in words is "one billion, two hundred seven million, six hundred sixty-four thousand, six hundred thirty-nine".