646109742 has 16 divisors (see below), whose sum is σ = 1294497360. Its totient is φ = 214990272.

The previous prime is 646109729. The next prime is 646109771. The reversal of 646109742 is 247901646.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 646109742.

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, 91213 + ... + 98040.

It is an arithmetic number, because the mean of its divisors is an integer number (80906085).

Almost surely, 2^646109742 is an apocalyptic number.

646109742 is an abundant number, since it is smaller than the sum of its proper divisors (648387618).

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

646109742 is a wasteful number, since it uses less digits than its factorization.

646109742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189827.

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

The square root of 646109742 is about 25418.6888332188. The cubic root of 646109742 is about 864.5074955950.

The spelling of 646109742 in words is "six hundred forty-six million, one hundred nine thousand, seven hundred forty-two".