64643836 has 24 divisors (see below), whose sum is σ = 115804080. Its totient is φ = 31565952.

The previous prime is 64643801. The next prime is 64643849. The reversal of 64643836 is 63834646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30210 + ... + 32278.

It is an arithmetic number, because the mean of its divisors is an integer number (4825170).

Almost surely, 2^64643836 is an apocalyptic number.

It is an amenable number.

64643836 is a deficient number, since it is larger than the sum of its proper divisors (51160244).

64643836 is a wasteful number, since it uses less digits than its factorization.

64643836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2253 (or 2251 counting only the distinct ones).

The product of its digits is 248832, while the sum is 40.

The square root of 64643836 is about 8040.1390535239. The cubic root of 64643836 is about 401.3368520888.

The spelling of 64643836 in words is "sixty-four million, six hundred forty-three thousand, eight hundred thirty-six".