64283920 has 20 divisors (see below), whose sum is σ = 149460300. Its totient is φ = 25713536.

The previous prime is 64283917. The next prime is 64283957. The reversal of 64283920 is 2938246.

It can be written as a sum of positive squares in 2 ways, for example, as 44782864 + 19501056 = 6692^2 + 4416^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401695 + ... + 401854.

It is an arithmetic number, because the mean of its divisors is an integer number (7473015).

Almost surely, 2^64283920 is an apocalyptic number.

It is an amenable number.

64283920 is an abundant number, since it is smaller than the sum of its proper divisors (85176380).

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

64283920 is a wasteful number, since it uses less digits than its factorization.

64283920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803562 (or 803556 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 64283920 is about 8017.7253632187. The cubic root of 64283920 is about 400.5906274687.

The spelling of 64283920 in words is "sixty-four million, two hundred eighty-three thousand, nine hundred twenty".