647698942 has 16 divisors (see below), whose sum is σ = 1115654400. Its totient is φ = 278913240.

The previous prime is 647698921. The next prime is 647698967. The reversal of 647698942 is 249896746.

It is a happy number.

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, 774342 + ... + 775177.

It is an arithmetic number, because the mean of its divisors is an integer number (69728400).

Almost surely, 2^647698942 is an apocalyptic number.

647698942 is a deficient number, since it is larger than the sum of its proper divisors (467955458).

647698942 is a wasteful number, since it uses less digits than its factorization.

647698942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549551.

The product of its digits is 5225472, while the sum is 55.

The square root of 647698942 is about 25449.9300981358. The cubic root of 647698942 is about 865.2157088415.

The spelling of 647698942 in words is "six hundred forty-seven million, six hundred ninety-eight thousand, nine hundred forty-two".