646031364 has 48 divisors (see below), whose sum is σ = 1650390336. Its totient is φ = 195059200.

The previous prime is 646031341. The next prime is 646031377. The reversal of 646031364 is 463130646.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28384 + ... + 45800.

It is an arithmetic number, because the mean of its divisors is an integer number (34383132).

Almost surely, 2^646031364 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 646031364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (825195168).

646031364 is an abundant number, since it is smaller than the sum of its proper divisors (1004358972).

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

646031364 is a wasteful number, since it uses less digits than its factorization.

646031364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17716 (or 17714 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 646031364 is about 25417.1470468265. The cubic root of 646031364 is about 864.4725370814.

The spelling of 646031364 in words is "six hundred forty-six million, thirty-one thousand, three hundred sixty-four".