64939775 has 6 divisors (see below), whose sum is σ = 80525352. Its totient is φ = 51951800.

The previous prime is 64939769. The next prime is 64939783. The reversal of 64939775 is 57793946.

It is not a de Polignac number, because 64939775 - 2⁸ = 64939519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1298771 + ... + 1298820.

It is an arithmetic number, because the mean of its divisors is an integer number (13420892).

Almost surely, 2^64939775 is an apocalyptic number.

64939775 is a deficient number, since it is larger than the sum of its proper divisors (15585577).

64939775 is a wasteful number, since it uses less digits than its factorization.

64939775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2597601 (or 2597596 counting only the distinct ones).

The product of its digits is 1428840, while the sum is 50.

The square root of 64939775 is about 8058.5218867979. The cubic root of 64939775 is about 401.9483589185.

The spelling of 64939775 in words is "sixty-four million, nine hundred thirty-nine thousand, seven hundred seventy-five".