647640274 has 8 divisors (see below), whose sum is σ = 985143168. Its totient is φ = 319259220.

The previous prime is 647640247. The next prime is 647640281. The reversal of 647640274 is 472046746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2280282 + ... + 2280565.

It is an arithmetic number, because the mean of its divisors is an integer number (123142896).

Almost surely, 2^647640274 is an apocalyptic number.

647640274 is a deficient number, since it is larger than the sum of its proper divisors (337502894).

647640274 is a wasteful number, since it uses less digits than its factorization.

647640274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4560920.

The product of its (nonzero) digits is 225792, while the sum is 40.

The square root of 647640274 is about 25448.7774559015. Note that the first 3 decimals coincide. The cubic root of 647640274 is about 865.1895845603.

The spelling of 647640274 in words is "six hundred forty-seven million, six hundred forty thousand, two hundred seventy-four".