64923978 has 16 divisors (see below), whose sum is σ = 148397760. Its totient is φ = 18549696.

The previous prime is 64923941. The next prime is 64923983. The reversal of 64923978 is 87932946.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 772863 + ... + 772946.

It is an arithmetic number, because the mean of its divisors is an integer number (9274860).

Almost surely, 2^64923978 is an apocalyptic number.

64923978 is an abundant number, since it is smaller than the sum of its proper divisors (83473782).

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

64923978 is a wasteful number, since it uses less digits than its factorization.

64923978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545821.

The product of its digits is 653184, while the sum is 48.

The square root of 64923978 is about 8057.5416846579. The cubic root of 64923978 is about 401.9157641379.

The spelling of 64923978 in words is "sixty-four million, nine hundred twenty-three thousand, nine hundred seventy-eight".