64979968 has 88 divisors (see below), whose sum is σ = 141488640. Its totient is φ = 29736960.

The previous prime is 64979963. The next prime is 64979969. The reversal of 64979968 is 86997946.

It is not an unprimeable number, because it can be changed into a prime (64979963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 730068 + ... + 730156.

Almost surely, 2^64979968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64979968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70744320).

64979968 is an abundant number, since it is smaller than the sum of its proper divisors (76508672).

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

64979968 is a wasteful number, since it uses less digits than its factorization.

64979968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 145 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 58.

The square root of 64979968 is about 8061.0153206653. The cubic root of 64979968 is about 402.0312674210.

The spelling of 64979968 in words is "sixty-four million, nine hundred seventy-nine thousand, nine hundred sixty-eight".