647158 has 4 divisors (see below), whose sum is σ = 970740. Its totient is φ = 323578.

The previous prime is 647147. The next prime is 647161. The reversal of 647158 is 851746.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161788 + ... + 161791.

It is an arithmetic number, because the mean of its divisors is an integer number (242685).

2⁶⁴⁷¹⁵⁸ is an apocalyptic number.

647158 is a deficient number, since it is larger than the sum of its proper divisors (323582).

647158 is a wasteful number, since it uses less digits than its factorization.

647158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323581.

The product of its digits is 6720, while the sum is 31.

The square root of 647158 is about 804.4613104432. The cubic root of 647158 is about 86.4974772895.

The spelling of 647158 in words is "six hundred forty-seven thousand, one hundred fifty-eight".