64978935 has 16 divisors (see below), whose sum is σ = 118818816. Its totient is φ = 29704608.

The previous prime is 64978931. The next prime is 64978943. The reversal of 64978935 is 53987946.

It is not a de Polignac number, because 64978935 - 2² = 64978931 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64978931) by changing a digit.

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, 309319 + ... + 309528.

It is an arithmetic number, because the mean of its divisors is an integer number (7426176).

Almost surely, 2^64978935 is an apocalyptic number.

64978935 is a deficient number, since it is larger than the sum of its proper divisors (53839881).

64978935 is a wasteful number, since it uses less digits than its factorization.

64978935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618862.

The product of its digits is 1632960, while the sum is 51.

The square root of 64978935 is about 8060.9512465961. The cubic root of 64978935 is about 402.0291370183.

The spelling of 64978935 in words is "sixty-four million, nine hundred seventy-eight thousand, nine hundred thirty-five".