64763920 has 40 divisors (see below), whose sum is σ = 162161496. Its totient is φ = 23912448.

The previous prime is 64763903. The next prime is 64763971. The reversal of 64763920 is 2936746.

It can be written as a sum of positive squares in 4 ways, for example, as 186624 + 64577296 = 432^2 + 8036^2 .

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

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 64763920.

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 7 ways as a sum of consecutive naturals, for example, 30097 + ... + 32176.

Almost surely, 2^64763920 is an apocalyptic number.

It is an amenable number.

64763920 is an abundant number, since it is smaller than the sum of its proper divisors (97397576).

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

64763920 is a wasteful number, since it uses less digits than its factorization.

64763920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62299 (or 62293 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 64763920 is about 8047.6033699481. The cubic root of 64763920 is about 401.5852094784.

The spelling of 64763920 in words is "sixty-four million, seven hundred sixty-three thousand, nine hundred twenty".