647674 has 4 divisors (see below), whose sum is σ = 971514. Its totient is φ = 323836.

The previous prime is 647663. The next prime is 647687. The reversal of 647674 is 476746.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 476746 = 2 ⋅238373.

It can be written as a sum of positive squares in only one way, i.e., 390625 + 257049 = 625^2 + 507^2 .

It is a super-2 number, since 2×647674² = 838963220552, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161917 + ... + 161920.

2⁶⁴⁷⁶⁷⁴ is an apocalyptic number.

647674 is a deficient number, since it is larger than the sum of its proper divisors (323840).

647674 is a wasteful number, since it uses less digits than its factorization.

647674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323839.

The product of its digits is 28224, while the sum is 34.

The square root of 647674 is about 804.7819580483. The cubic root of 647674 is about 86.5204602608.

The spelling of 647674 in words is "six hundred forty-seven thousand, six hundred seventy-four".