64820975 has 12 divisors (see below), whose sum is σ = 80493360. Its totient is φ = 51782400.

The previous prime is 64820963. The next prime is 64820993. The reversal of 64820975 is 57902846.

It is a de Polignac number, because none of the positive numbers 2^k-64820975 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21830 + ... + 24620.

It is an arithmetic number, because the mean of its divisors is an integer number (6707780).

Almost surely, 2^64820975 is an apocalyptic number.

64820975 is a deficient number, since it is larger than the sum of its proper divisors (15672385).

64820975 is a wasteful number, since it uses less digits than its factorization.

64820975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3730 (or 3725 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 64820975 is about 8051.1474337513. The cubic root of 64820975 is about 401.7031028931.

The spelling of 64820975 in words is "sixty-four million, eight hundred twenty thousand, nine hundred seventy-five".