646443354 has 32 divisors (see below), whose sum is σ = 1336809600. Its totient is φ = 208239552.

The previous prime is 646443323. The next prime is 646443361. The reversal of 646443354 is 453344646.

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, 23307 + ... + 42849.

It is an arithmetic number, because the mean of its divisors is an integer number (41775300).

Almost surely, 2^646443354 is an apocalyptic number.

646443354 is an abundant number, since it is smaller than the sum of its proper divisors (690366246).

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

646443354 is a wasteful number, since it uses less digits than its factorization.

646443354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19734.

The product of its digits is 414720, while the sum is 39.

The square root of 646443354 is about 25425.2503232515. The cubic root of 646443354 is about 864.6562631242.

The spelling of 646443354 in words is "six hundred forty-six million, four hundred forty-three thousand, three hundred fifty-four".