64821224 has 16 divisors (see below), whose sum is σ = 130889220. Its totient is φ = 29917440.

The previous prime is 64821209. The next prime is 64821233. The reversal of 64821224 is 42212846.

It can be written as a sum of positive squares in 2 ways, for example, as 64288324 + 532900 = 8018^2 + 730^2 .

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, 311537 + ... + 311744.

Almost surely, 2^64821224 is an apocalyptic number.

It is an amenable number.

64821224 is an abundant number, since it is smaller than the sum of its proper divisors (66067996).

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

64821224 is a wasteful number, since it uses less digits than its factorization.

64821224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623300 (or 623296 counting only the distinct ones).

The product of its digits is 6144, while the sum is 29.

The square root of 64821224 is about 8051.1628973708. The cubic root of 64821224 is about 401.7036172531.

The spelling of 64821224 in words is "sixty-four million, eight hundred twenty-one thousand, two hundred twenty-four".