64221636 has 12 divisors (see below), whose sum is σ = 149850512. Its totient is φ = 21407208.

The previous prime is 64221623. The next prime is 64221673. The reversal of 64221636 is 63612246.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2675890 + ... + 2675913.

Almost surely, 2^64221636 is an apocalyptic number.

It is an amenable number.

64221636 is an abundant number, since it is smaller than the sum of its proper divisors (85628876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64221636 is a wasteful number, since it uses less digits than its factorization.

64221636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5351810 (or 5351808 counting only the distinct ones).

The product of its digits is 10368, while the sum is 30.

The square root of 64221636 is about 8013.8402779192. The cubic root of 64221636 is about 400.4612096764.

The spelling of 64221636 in words is "sixty-four million, two hundred twenty-one thousand, six hundred thirty-six".