636713057 has 4 divisors (see below), whose sum is σ = 653921556. Its totient is φ = 619504560.

The previous prime is 636713041. The next prime is 636713069. The reversal of 636713057 is 750317636.

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

It can be written as a sum of positive squares in 2 ways, for example, as 316875601 + 319837456 = 17801^2 + 17884^2 .

It is a cyclic number.

It is not a de Polignac number, because 636713057 - 2⁴ = 636713041 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 636713057.

It is not an unprimeable number, because it can be changed into a prime (636710057) 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, 8604194 + ... + 8604267.

It is an arithmetic number, because the mean of its divisors is an integer number (163480389).

Almost surely, 2^636713057 is an apocalyptic number.

It is an amenable number.

636713057 is a deficient number, since it is larger than the sum of its proper divisors (17208499).

636713057 is a wasteful number, since it uses less digits than its factorization.

636713057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17208498.

The product of its (nonzero) digits is 79380, while the sum is 38.

The square root of 636713057 is about 25233.1737401382. The cubic root of 636713057 is about 860.2960297815.

The spelling of 636713057 in words is "six hundred thirty-six million, seven hundred thirteen thousand, fifty-seven".