646442374 has 16 divisors (see below), whose sum is σ = 1027213488. Its totient is φ = 304056832.

The previous prime is 646442359. The next prime is 646442477. The reversal of 646442374 is 473244646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95217 + ... + 101779.

It is an arithmetic number, because the mean of its divisors is an integer number (64200843).

Almost surely, 2^646442374 is an apocalyptic number.

646442374 is a deficient number, since it is larger than the sum of its proper divisors (380771114).

646442374 is a wasteful number, since it uses less digits than its factorization.

646442374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9479.

The product of its digits is 387072, while the sum is 40.

The square root of 646442374 is about 25425.2310510642. The cubic root of 646442374 is about 864.6558261880.

The spelling of 646442374 in words is "six hundred forty-six million, four hundred forty-two thousand, three hundred seventy-four".