64620620 has 24 divisors (see below), whose sum is σ = 136460688. Its totient is φ = 25704000.

The previous prime is 64620607. The next prime is 64620623. The reversal of 64620620 is 2602646.

It is a self number, because there is not a number n which added to its sum of digits gives 64620620.

It is not an unprimeable number, because it can be changed into a prime (64620623) by changing a digit.

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, 5306 + ... + 12545.

It is an arithmetic number, because the mean of its divisors is an integer number (5685862).

Almost surely, 2^64620620 is an apocalyptic number.

It is an amenable number.

64620620 is an abundant number, since it is smaller than the sum of its proper divisors (71840068).

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

64620620 is a wasteful number, since it uses less digits than its factorization.

64620620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18041 (or 18039 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 64620620 is about 8038.6951677496. The cubic root of 64620620 is about 401.2888013512.

The spelling of 64620620 in words is "sixty-four million, six hundred twenty thousand, six hundred twenty".