688256430 has 16 divisors (see below), whose sum is σ = 1651815504. Its totient is φ = 183535040.

The previous prime is 688256423. The next prime is 688256431. The reversal of 688256430 is 34652886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688256431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11470911 + ... + 11470970.

It is an arithmetic number, because the mean of its divisors is an integer number (103238469).

Almost surely, 2^688256430 is an apocalyptic number.

688256430 is an abundant number, since it is smaller than the sum of its proper divisors (963559074).

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

688256430 is a wasteful number, since it uses less digits than its factorization.

688256430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22941891.

The product of its (nonzero) digits is 276480, while the sum is 42.

The square root of 688256430 is about 26234.6417928662. The cubic root of 688256430 is about 882.9106574785.

The spelling of 688256430 in words is "six hundred eighty-eight million, two hundred fifty-six thousand, four hundred thirty".