646312620 has 24 divisors (see below), whose sum is σ = 1809675504. Its totient is φ = 172350016.

The previous prime is 646312591. The next prime is 646312621. The reversal of 646312620 is 26213646.

646312620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (646312621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5385879 + ... + 5385998.

It is an arithmetic number, because the mean of its divisors is an integer number (75403146).

Almost surely, 2^646312620 is an apocalyptic number.

646312620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646312620 is an abundant number, since it is smaller than the sum of its proper divisors (1163362884).

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

646312620 is a wasteful number, since it uses less digits than its factorization.

646312620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10771889 (or 10771887 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 646312620 is about 25422.6792451150. The cubic root of 646312620 is about 864.5979710391.

The spelling of 646312620 in words is "six hundred forty-six million, three hundred twelve thousand, six hundred twenty".