64620220806 has 12 divisors (see below), whose sum is σ = 140010478452. Its totient is φ = 21540073596.

The previous prime is 64620220759. The next prime is 64620220877. The reversal of 64620220806 is 60802202646.

64620220806 is a `hidden beast` number, since 6 + 4 + 620 + 2 + 20 + 8 + 0 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1795006116 + ... + 1795006151.

It is an arithmetic number, because the mean of its divisors is an integer number (11667539871).

Almost surely, 2^64620220806 is an apocalyptic number.

64620220806 is an abundant number, since it is smaller than the sum of its proper divisors (75390257646).

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

64620220806 is a wasteful number, since it uses less digits than its factorization.

64620220806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3590012275 (or 3590012272 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The spelling of 64620220806 in words is "sixty-four billion, six hundred twenty million, two hundred twenty thousand, eight hundred six".