647978246 has 16 divisors (see below), whose sum is σ = 980395920. Its totient is φ = 321186720.

The previous prime is 647978209. The next prime is 647978249. The reversal of 647978246 is 642879746.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647978249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260360 + ... + 262836.

It is an arithmetic number, because the mean of its divisors is an integer number (61274745).

Almost surely, 2^647978246 is an apocalyptic number.

647978246 is a deficient number, since it is larger than the sum of its proper divisors (332417674).

647978246 is a wasteful number, since it uses less digits than its factorization.

647978246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3559.

The product of its digits is 4064256, while the sum is 53.

The square root of 647978246 is about 25455.4168302151. The cubic root of 647978246 is about 865.3400585276.

The spelling of 647978246 in words is "six hundred forty-seven million, nine hundred seventy-eight thousand, two hundred forty-six".