64636357 has 2 divisors, whose sum is σ = 64636358. Its totient is φ = 64636356.

The previous prime is 64636343. The next prime is 64636381. The reversal of 64636357 is 75363646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48427681 + 16208676 = 6959^2 + 4026^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64636357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64636387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32318178 + 32318179.

It is an arithmetic number, because the mean of its divisors is an integer number (32318179).

Almost surely, 2^64636357 is an apocalyptic number.

It is an amenable number.

64636357 is a deficient number, since it is larger than the sum of its proper divisors (1).

64636357 is an equidigital number, since it uses as much as digits as its factorization.

64636357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 40.

The square root of 64636357 is about 8039.6739361743. The cubic root of 64636357 is about 401.3213738712.

The spelling of 64636357 in words is "sixty-four million, six hundred thirty-six thousand, three hundred fifty-seven".