646490600 has 96 divisors (see below), whose sum is σ = 1728966720. Its totient is φ = 220216320.

The previous prime is 646490549. The next prime is 646490639. The reversal of 646490600 is 6094646.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 226784 + ... + 229616.

It is an arithmetic number, because the mean of its divisors is an integer number (18010070).

Almost surely, 2^646490600 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646490600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (864483360).

646490600 is an abundant number, since it is smaller than the sum of its proper divisors (1082476120).

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

646490600 is a wasteful number, since it uses less digits than its factorization.

646490600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3019 (or 3010 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 646490600 is about 25426.1794220052. The cubic root of 646490600 is about 864.6773273852.

The spelling of 646490600 in words is "six hundred forty-six million, four hundred ninety thousand, six hundred".