658998 has 24 divisors (see below), whose sum is σ = 1475136. Its totient is φ = 212400.

The previous prime is 658997. The next prime is 659011. The reversal of 658998 is 899856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (658991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33 + ... + 1148.

It is an arithmetic number, because the mean of its divisors is an integer number (61464).

2⁶⁵⁸⁹⁹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 658998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (737568).

658998 is an abundant number, since it is smaller than the sum of its proper divisors (816138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

658998 is a wasteful number, since it uses less digits than its factorization.

658998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220 (or 1217 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 658998 is about 811.7869178547. The cubic root of 658998 is about 87.0217939851.

The spelling of 658998 in words is "six hundred fifty-eight thousand, nine hundred ninety-eight".