688357432 has 32 divisors (see below), whose sum is σ = 1539187200. Its totient is φ = 282183264.

The previous prime is 688357391. The next prime is 688357451. The reversal of 688357432 is 234753886.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265932 + ... + 268507.

It is an arithmetic number, because the mean of its divisors is an integer number (48099600).

Almost surely, 2^688357432 is an apocalyptic number.

It is an amenable number.

688357432 is an abundant number, since it is smaller than the sum of its proper divisors (850829768).

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

688357432 is a wasteful number, since it uses less digits than its factorization.

688357432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534475 (or 534471 counting only the distinct ones).

The product of its digits is 967680, while the sum is 46.

The square root of 688357432 is about 26236.5666961209. The cubic root of 688357432 is about 882.9538445700.

It can be divided in two parts, 68835 and 7432, that added together give a palindrome (76267).

The spelling of 688357432 in words is "six hundred eighty-eight million, three hundred fifty-seven thousand, four hundred thirty-two".