646498020 has 48 divisors (see below), whose sum is σ = 2068795008. Its totient is φ = 147770880.

The previous prime is 646497997. The next prime is 646498033. The reversal of 646498020 is 20894646.

It is a self number, because there is not a number n which added to its sum of digits gives 646498020.

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 15 ways as a sum of consecutive naturals, for example, 769221 + ... + 770060.

It is an arithmetic number, because the mean of its divisors is an integer number (43099896).

Almost surely, 2^646498020 is an apocalyptic number.

646498020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646498020 is an abundant number, since it is smaller than the sum of its proper divisors (1422296988).

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

646498020 is a wasteful number, since it uses less digits than its factorization.

646498020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539300 (or 1539298 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 646498020 is about 25426.3253341886. The cubic root of 646498020 is about 864.6806354412.

The spelling of 646498020 in words is "six hundred forty-six million, four hundred ninety-eight thousand, twenty".