64136887 has 2 divisors, whose sum is σ = 64136888. Its totient is φ = 64136886.

The previous prime is 64136881. The next prime is 64136899. The reversal of 64136887 is 78863146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64136887 - 2⁷ = 64136759 is a prime.

It is a super-2 number, since 2×64136887² = 8227080548101538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64136881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32068443 + 32068444.

It is an arithmetic number, because the mean of its divisors is an integer number (32068444).

Almost surely, 2^64136887 is an apocalyptic number.

64136887 is a deficient number, since it is larger than the sum of its proper divisors (1).

64136887 is an equidigital number, since it uses as much as digits as its factorization.

64136887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 43.

The square root of 64136887 is about 8008.5508676664. The cubic root of 64136887 is about 400.2849781704.

The spelling of 64136887 in words is "sixty-four million, one hundred thirty-six thousand, eight hundred eighty-seven".