647858 has 8 divisors (see below), whose sum is σ = 976752. Its totient is φ = 322276.

The previous prime is 647851. The next prime is 647861. The reversal of 647858 is 858746.

647858 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (647851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260 + ... + 1167.

It is an arithmetic number, because the mean of its divisors is an integer number (122094).

2⁶⁴⁷⁸⁵⁸ is an apocalyptic number.

647858 is a deficient number, since it is larger than the sum of its proper divisors (328894).

647858 is a wasteful number, since it uses less digits than its factorization.

647858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656.

The product of its digits is 53760, while the sum is 38.

The square root of 647858 is about 804.8962666083. The cubic root of 647858 is about 86.5286527863.

The spelling of 647858 in words is "six hundred forty-seven thousand, eight hundred fifty-eight".