646490376 has 128 divisors (see below), whose sum is σ = 2087424000. Its totient is φ = 181555776.

The previous prime is 646490357. The next prime is 646490387. The reversal of 646490376 is 673094646.

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, 85585 + ... + 92831.

It is an arithmetic number, because the mean of its divisors is an integer number (16308000).

Almost surely, 2^646490376 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 646490376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1043712000).

646490376 is an abundant number, since it is smaller than the sum of its proper divisors (1440933624).

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

646490376 is a wasteful number, since it uses less digits than its factorization.

646490376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7328 (or 7318 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 45.

The square root of 646490376 is about 25426.1750170961. The cubic root of 646490376 is about 864.6772275190.

The spelling of 646490376 in words is "six hundred forty-six million, four hundred ninety thousand, three hundred seventy-six".