64636387 has 2 divisors, whose sum is σ = 64636388. Its totient is φ = 64636386.

The previous prime is 64636381. The next prime is 64636391. The reversal of 64636387 is 78363646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64636387 - 2⁷ = 64636259 is a prime.

It is not a weakly prime, because it can be changed into another prime (64636381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32318193 + 32318194.

It is an arithmetic number, because the mean of its divisors is an integer number (32318194).

Almost surely, 2^64636387 is an apocalyptic number.

64636387 is a deficient number, since it is larger than the sum of its proper divisors (1).

64636387 is an equidigital number, since it uses as much as digits as its factorization.

64636387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 43.

The square root of 64636387 is about 8039.6758019214. The cubic root of 64636387 is about 401.3214359603.

The spelling of 64636387 in words is "sixty-four million, six hundred thirty-six thousand, three hundred eighty-seven".