656998 has 8 divisors (see below), whose sum is σ = 996840. Its totient is φ = 324720.

The previous prime is 656993. The next prime is 657017. The reversal of 656998 is 899656.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656993) by changing a digit.

656998 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1668 + ... + 2023.

It is an arithmetic number, because the mean of its divisors is an integer number (124605).

2⁶⁵⁶⁹⁹⁸ is an apocalyptic number.

656998 is a deficient number, since it is larger than the sum of its proper divisors (339842).

656998 is a wasteful number, since it uses less digits than its factorization.

656998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3782.

The product of its digits is 116640, while the sum is 43.

The square root of 656998 is about 810.5541314434. The cubic root of 656998 is about 86.9336703215.

The spelling of 656998 in words is "six hundred fifty-six thousand, nine hundred ninety-eight".