64989220 has 12 divisors (see below), whose sum is σ = 136477404. Its totient is φ = 25995680.

The previous prime is 64989193. The next prime is 64989247. The reversal of 64989220 is 2298946.

It is an interprime number because it is at equal distance from previous prime (64989193) and next prime (64989247).

It can be written as a sum of positive squares in 2 ways, for example, as 7107556 + 57881664 = 2666^2 + 7608^2 .

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, 1624711 + ... + 1624750.

It is an arithmetic number, because the mean of its divisors is an integer number (11373117).

Almost surely, 2^64989220 is an apocalyptic number.

It is an amenable number.

64989220 is an abundant number, since it is smaller than the sum of its proper divisors (71488184).

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

64989220 is a wasteful number, since it uses less digits than its factorization.

64989220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3249470 (or 3249468 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 64989220 is about 8061.5891733578. The cubic root of 64989220 is about 402.0503472333.

The spelling of 64989220 in words is "sixty-four million, nine hundred eighty-nine thousand, two hundred twenty".