64645636 has 24 divisors (see below), whose sum is σ = 123621120. Its totient is φ = 29335200.

The previous prime is 64645631. The next prime is 64645639. The reversal of 64645636 is 63654646.

It is not an unprimeable number, because it can be changed into a prime (64645631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44205 + ... + 45643.

It is an arithmetic number, because the mean of its divisors is an integer number (5150880).

Almost surely, 2^64645636 is an apocalyptic number.

It is an amenable number.

64645636 is a deficient number, since it is larger than the sum of its proper divisors (58975484).

64645636 is a wasteful number, since it uses less digits than its factorization.

64645636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2475 (or 2473 counting only the distinct ones).

The product of its digits is 311040, while the sum is 40.

The square root of 64645636 is about 8040.2509911072. The cubic root of 64645636 is about 401.3405771133.

It can be divided in two parts, 6464 and 5636, that added together give a square (12100 = 110²).

The spelling of 64645636 in words is "sixty-four million, six hundred forty-five thousand, six hundred thirty-six".