656543232 has 140 divisors (see below), whose sum is σ = 1967924640. Its totient is φ = 218723328.

The previous prime is 656543219. The next prime is 656543249. The reversal of 656543232 is 232345656.

656543232 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 372369 + ... + 374127.

Almost surely, 2^656543232 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 656543232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (983962320).

656543232 is an abundant number, since it is smaller than the sum of its proper divisors (1311381408).

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

656543232 is an frugal number, since it uses more digits than its factorization.

656543232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795 (or 1764 counting only the distinct ones).

The product of its digits is 129600, while the sum is 36.

The square root of 656543232 is about 25623.0995783102. The cubic root of 656543232 is about 869.1360746143.

Adding to 656543232 its reverse (232345656), we get a palindrome (888888888).

It can be divided in two parts, 65654 and 3232, that added together give a palindrome (68886).

The spelling of 656543232 in words is "six hundred fifty-six million, five hundred forty-three thousand, two hundred thirty-two".