64978969 has 16 divisors (see below), whose sum is σ = 72584640. Its totient is φ = 57672000.

The previous prime is 64978967. The next prime is 64978997. The reversal of 64978969 is 96987946.

64978969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 64978969 - 2¹ = 64978967 is a prime.

It is a super-2 number, since 2×64978969² = 8444532824605922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64978961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119839 + ... + 120379.

It is an arithmetic number, because the mean of its divisors is an integer number (4536540).

Almost surely, 2^64978969 is an apocalyptic number.

It is an amenable number.

64978969 is a deficient number, since it is larger than the sum of its proper divisors (7605671).

64978969 is a wasteful number, since it uses less digits than its factorization.

64978969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792.

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

The square root of 64978969 is about 8060.9533555281. The cubic root of 64978969 is about 402.0292071384.

The spelling of 64978969 in words is "sixty-four million, nine hundred seventy-eight thousand, nine hundred sixty-nine".