64577220 has 48 divisors (see below), whose sum is σ = 191455488. Its totient is φ = 16207360.

The previous prime is 64577209. The next prime is 64577231. The reversal of 64577220 is 2277546.

It is an interprime number because it is at equal distance from previous prime (64577209) and next prime (64577231).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30636 + ... + 32675.

It is an arithmetic number, because the mean of its divisors is an integer number (3988656).

Almost surely, 2^64577220 is an apocalyptic number.

64577220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64577220 is an abundant number, since it is smaller than the sum of its proper divisors (126878268).

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

64577220 is a wasteful number, since it uses less digits than its factorization.

64577220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63340 (or 63338 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 33.

The square root of 64577220 is about 8035.9952712779. The cubic root of 64577220 is about 401.1989444069.

The spelling of 64577220 in words is "sixty-four million, five hundred seventy-seven thousand, two hundred twenty".