64187636 has 6 divisors (see below), whose sum is σ = 112328370. Its totient is φ = 32093816.

The previous prime is 64187603. The next prime is 64187647. The reversal of 64187636 is 63678146.

It can be written as a sum of positive squares in only one way, i.e., 37210000 + 26977636 = 6100^2 + 5194^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64187593 and 64187602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8023451 + ... + 8023458.

It is an arithmetic number, because the mean of its divisors is an integer number (18721395).

Almost surely, 2^64187636 is an apocalyptic number.

It is an amenable number.

64187636 is a deficient number, since it is larger than the sum of its proper divisors (48140734).

64187636 is a wasteful number, since it uses less digits than its factorization.

64187636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16046913 (or 16046911 counting only the distinct ones).

The product of its digits is 145152, while the sum is 41.

The square root of 64187636 is about 8011.7186670527. The cubic root of 64187636 is about 400.3905269310.

The spelling of 64187636 in words is "sixty-four million, one hundred eighty-seven thousand, six hundred thirty-six".