688373407 has 4 divisors (see below), whose sum is σ = 688524480. Its totient is φ = 688222336.

The previous prime is 688373341. The next prime is 688373423. The reversal of 688373407 is 704373886.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688373407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688373447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68482 + ... + 77887.

It is an arithmetic number, because the mean of its divisors is an integer number (172131120).

Almost surely, 2^688373407 is an apocalyptic number.

688373407 is a deficient number, since it is larger than the sum of its proper divisors (151073).

688373407 is a wasteful number, since it uses less digits than its factorization.

688373407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151072.

The product of its (nonzero) digits is 677376, while the sum is 46.

The square root of 688373407 is about 26236.8711358653. The cubic root of 688373407 is about 882.9606748774.

The spelling of 688373407 in words is "six hundred eighty-eight million, three hundred seventy-three thousand, four hundred seven".