647674351 has 4 divisors (see below), whose sum is σ = 668567104. Its totient is φ = 626781600.

The previous prime is 647674343. The next prime is 647674373. The reversal of 647674351 is 153476746.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 647674351 - 2³ = 647674343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647674298 and 647674307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647674301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10446330 + ... + 10446391.

It is an arithmetic number, because the mean of its divisors is an integer number (167141776).

Almost surely, 2^647674351 is an apocalyptic number.

647674351 is a deficient number, since it is larger than the sum of its proper divisors (20892753).

647674351 is a wasteful number, since it uses less digits than its factorization.

647674351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20892752.

The product of its digits is 423360, while the sum is 43.

The square root of 647674351 is about 25449.4469684510. The cubic root of 647674351 is about 865.2047589040.

It can be divided in two parts, 647674 and 351, that added together give a square (648025 = 805²).

The spelling of 647674351 in words is "six hundred forty-seven million, six hundred seventy-four thousand, three hundred fifty-one".