647640355 has 8 divisors (see below), whose sum is σ = 789909264. Its totient is φ = 509618400.

The previous prime is 647640353. The next prime is 647640373. The reversal of 647640355 is 553046746.

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

It is not a de Polignac number, because 647640355 - 2¹ = 647640353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647640353) 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, 1061401 + ... + 1062010.

It is an arithmetic number, because the mean of its divisors is an integer number (98738658).

Almost surely, 2^647640355 is an apocalyptic number.

647640355 is a deficient number, since it is larger than the sum of its proper divisors (142268909).

647640355 is a wasteful number, since it uses less digits than its factorization.

647640355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2123477.

The product of its (nonzero) digits is 302400, while the sum is 40.

The square root of 647640355 is about 25448.7790473335. The cubic root of 647640355 is about 865.1896206299.

The spelling of 647640355 in words is "six hundred forty-seven million, six hundred forty thousand, three hundred fifty-five".