64791820 has 12 divisors (see below), whose sum is σ = 136062864. Its totient is φ = 25916720.

The previous prime is 64791809. The next prime is 64791833. The reversal of 64791820 is 2819746.

64791820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 64791820.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1619776 + ... + 1619815.

It is an arithmetic number, because the mean of its divisors is an integer number (11338572).

Almost surely, 2^64791820 is an apocalyptic number.

It is an amenable number.

64791820 is an abundant number, since it is smaller than the sum of its proper divisors (71271044).

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

64791820 is a wasteful number, since it uses less digits than its factorization.

64791820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3239600 (or 3239598 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 64791820 is about 8049.3366186289. The cubic root of 64791820 is about 401.6428682222.

The spelling of 64791820 in words is "sixty-four million, seven hundred ninety-one thousand, eight hundred twenty".