658240 has 84 divisors (see below), whose sum is σ = 1824228. Its totient is φ = 225280.

The previous prime is 658219. The next prime is 658247. The reversal of 658240 is 42856.

It can be written as a sum of positive squares in 2 ways, for example, as 379456 + 278784 = 616^2 + 528^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (658247) 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, 38712 + ... + 38728.

It is an arithmetic number, because the mean of its divisors is an integer number (21717).

2⁶⁵⁸²⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 658240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (912114).

658240 is an abundant number, since it is smaller than the sum of its proper divisors (1165988).

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

658240 is a wasteful number, since it uses less digits than its factorization.

658240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56 (or 35 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 658240 is about 811.3199122418. The cubic root of 658240 is about 86.9884161263.

It can be divided in two parts, 658 and 240, that added together give a palindrome (898).

The spelling of 658240 in words is "six hundred fifty-eight thousand, two hundred forty".