64131136 has 14 divisors (see below), whose sum is σ = 127260350. Its totient is φ = 32065536.

The previous prime is 64131121. The next prime is 64131143. The reversal of 64131136 is 63113146.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 59969536 + 4161600 = 7744^2 + 2040^2 .

It is a super-2 number, since 2×64131136² = 8225605209300992, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64131136.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500961 + ... + 501088.

It is an arithmetic number, because the mean of its divisors is an integer number (9090025).

Almost surely, 2^64131136 is an apocalyptic number.

It is an amenable number.

64131136 is a deficient number, since it is larger than the sum of its proper divisors (63129214).

64131136 is a wasteful number, since it uses less digits than its factorization.

64131136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002061 (or 1002051 counting only the distinct ones).

The product of its digits is 1296, while the sum is 25.

The square root of 64131136 is about 8008.1918058948. The cubic root of 64131136 is about 400.2730136165.

The spelling of 64131136 in words is "sixty-four million, one hundred thirty-one thousand, one hundred thirty-six".