64785920 has 40 divisors (see below), whose sum is σ = 155340504. Its totient is φ = 25913344.

The previous prime is 64785911. The next prime is 64785937. The reversal of 64785920 is 2958746.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10094 + ... + 15213.

Almost surely, 2^64785920 is an apocalyptic number.

It is an amenable number.

64785920 is an abundant number, since it is smaller than the sum of its proper divisors (90554584).

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

64785920 is an equidigital number, since it uses as much as digits as its factorization.

64785920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25330 (or 25314 counting only the distinct ones).

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

The square root of 64785920 is about 8048.9701204564. The cubic root of 64785920 is about 401.6306765348.

The spelling of 64785920 in words is "sixty-four million, seven hundred eighty-five thousand, nine hundred twenty".