64315404978 has 32 divisors (see below), whose sum is σ = 140522541120. Its totient is φ = 19462013760.

The previous prime is 64315404941. The next prime is 64315404991. The reversal of 64315404978 is 87940451346.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 64315404978.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 640425 + ... + 734012.

It is an arithmetic number, because the mean of its divisors is an integer number (4391329410).

Almost surely, 2^64315404978 is an apocalyptic number.

64315404978 is an abundant number, since it is smaller than the sum of its proper divisors (76207136142).

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

64315404978 is a wasteful number, since it uses less digits than its factorization.

64315404978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375162.

The product of its (nonzero) digits is 2903040, while the sum is 51.

The spelling of 64315404978 in words is "sixty-four billion, three hundred fifteen million, four hundred four thousand, nine hundred seventy-eight".