646704360 has 96 divisors (see below), whose sum is σ = 2106000000. Its totient is φ = 172109184.

The previous prime is 646704353. The next prime is 646704407. The reversal of 646704360 is 63407646.

646704360 is a `hidden beast` number, since 646 + 7 + 0 + 4 + 3 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 214141 + ... + 217139.

It is an arithmetic number, because the mean of its divisors is an integer number (21937500).

Almost surely, 2^646704360 is an apocalyptic number.

646704360 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646704360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1053000000).

646704360 is an abundant number, since it is smaller than the sum of its proper divisors (1459295640).

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

646704360 is a wasteful number, since it uses less digits than its factorization.

646704360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3615 (or 3608 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 646704360 is about 25430.3826160756. The cubic root of 646704360 is about 864.7726177925.

The spelling of 646704360 in words is "six hundred forty-six million, seven hundred four thousand, three hundred sixty".