64978766 has 4 divisors (see below), whose sum is σ = 97468152. Its totient is φ = 32489382.

The previous prime is 64978757. The next prime is 64978783. The reversal of 64978766 is 66787946.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16244690 + ... + 16244693.

It is an arithmetic number, because the mean of its divisors is an integer number (24367038).

Almost surely, 2^64978766 is an apocalyptic number.

64978766 is a deficient number, since it is larger than the sum of its proper divisors (32489386).

64978766 is a wasteful number, since it uses less digits than its factorization.

64978766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32489385.

The product of its digits is 3048192, while the sum is 53.

The square root of 64978766 is about 8060.9407639555. The cubic root of 64978766 is about 402.0287884798.

The spelling of 64978766 in words is "sixty-four million, nine hundred seventy-eight thousand, seven hundred sixty-six".