688673431 has 4 divisors (see below), whose sum is σ = 692797392. Its totient is φ = 684549472.

The previous prime is 688673407. The next prime is 688673441. The reversal of 688673431 is 134376886.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 688673431 - 2⁵ = 688673399 is a prime.

It is a super-2 number, since 2×688673431² = 948542189130623522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688673441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2061730 + ... + 2062063.

It is an arithmetic number, because the mean of its divisors is an integer number (173199348).

Almost surely, 2^688673431 is an apocalyptic number.

688673431 is a deficient number, since it is larger than the sum of its proper divisors (4123961).

688673431 is a wasteful number, since it uses less digits than its factorization.

688673431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4123960.

The product of its digits is 580608, while the sum is 46.

The square root of 688673431 is about 26242.5881155042. The cubic root of 688673431 is about 883.0889341979.

The spelling of 688673431 in words is "six hundred eighty-eight million, six hundred seventy-three thousand, four hundred thirty-one".