658638 has 16 divisors (see below), whose sum is σ = 1463760. Its totient is φ = 219528.

The previous prime is 658633. The next prime is 658639. The reversal of 658638 is 836856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (658633) by changing a digit.

658638 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 7 ways as a sum of consecutive naturals, for example, 6045 + ... + 6152.

It is an arithmetic number, because the mean of its divisors is an integer number (91485).

2⁶⁵⁸⁶³⁸ is an apocalyptic number.

658638 is an abundant number, since it is smaller than the sum of its proper divisors (805122).

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

658638 is a wasteful number, since it uses less digits than its factorization.

658638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12208 (or 12202 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 658638 is about 811.5651545009. The cubic root of 658638 is about 87.0059448970.

It can be divided in two parts, 658 and 638, that added together give a 4-th power (1296 = 6⁴).

The spelling of 658638 in words is "six hundred fifty-eight thousand, six hundred thirty-eight".