64220516 has 6 divisors (see below), whose sum is σ = 112385910. Its totient is φ = 32110256.

The previous prime is 64220489. The next prime is 64220521. The reversal of 64220516 is 61502246.

It can be written as a sum of positive squares in only one way, i.e., 63138916 + 1081600 = 7946^2 + 1040^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8027561 + ... + 8027568.

It is an arithmetic number, because the mean of its divisors is an integer number (18730985).

Almost surely, 2^64220516 is an apocalyptic number.

It is an amenable number.

64220516 is a deficient number, since it is larger than the sum of its proper divisors (48165394).

64220516 is a wasteful number, since it uses less digits than its factorization.

64220516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16055133 (or 16055131 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 64220516 is about 8013.7703985078. The cubic root of 64220516 is about 400.4588817010.

The spelling of 64220516 in words is "sixty-four million, two hundred twenty thousand, five hundred sixteen".