64626920 has 16 divisors (see below), whose sum is σ = 145410660. Its totient is φ = 25850752.

The previous prime is 64626917. The next prime is 64626937. The reversal of 64626920 is 2962646.

It can be written as a sum of positive squares in 2 ways, for example, as 60808804 + 3818116 = 7798^2 + 1954^2 .

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, 807797 + ... + 807876.

Almost surely, 2^64626920 is an apocalyptic number.

It is an amenable number.

64626920 is an abundant number, since it is smaller than the sum of its proper divisors (80783740).

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

64626920 is a wasteful number, since it uses less digits than its factorization.

64626920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615684 (or 1615680 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 64626920 is about 8039.0870128392. The cubic root of 64626920 is about 401.3018417569.

The spelling of 64626920 in words is "sixty-four million, six hundred twenty-six thousand, nine hundred twenty".