646974120 has 128 divisors (see below), whose sum is σ = 2096720640. Its totient is φ = 158760960.

The previous prime is 646974101. The next prime is 646974157. The reversal of 646974120 is 21479646.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 999637 + ... + 1000283.

It is an arithmetic number, because the mean of its divisors is an integer number (16380630).

Almost surely, 2^646974120 is an apocalyptic number.

646974120 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 646974120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1048360320).

646974120 is an abundant number, since it is smaller than the sum of its proper divisors (1449746520).

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

646974120 is a wasteful number, since it uses less digits than its factorization.

646974120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315 (or 1311 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 646974120 is about 25435.6859549728. The cubic root of 646974120 is about 864.8928420387.

The spelling of 646974120 in words is "six hundred forty-six million, nine hundred seventy-four thousand, one hundred twenty".