64978576 has 20 divisors (see below), whose sum is σ = 135580732. Its totient is φ = 29990016.

The previous prime is 64978567. The next prime is 64978577. The reversal of 64978576 is 67587946.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 23040000 + 41938576 = 4800^2 + 6476^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (64978577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155991 + ... + 156406.

Almost surely, 2^64978576 is an apocalyptic number.

It is an amenable number.

64978576 is an abundant number, since it is smaller than the sum of its proper divisors (70602156).

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

64978576 is a wasteful number, since it uses less digits than its factorization.

64978576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312418 (or 312412 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 52.

The square root of 64978576 is about 8060.9289787220. The cubic root of 64978576 is about 402.0283966311.

The spelling of 64978576 in words is "sixty-four million, nine hundred seventy-eight thousand, five hundred seventy-six".