687125734 has 4 divisors (see below), whose sum is σ = 1030688604. Its totient is φ = 343562866.

The previous prime is 687125701. The next prime is 687125743. The reversal of 687125734 is 437521786.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171781432 + ... + 171781435.

It is an arithmetic number, because the mean of its divisors is an integer number (257672151).

Almost surely, 2^687125734 is an apocalyptic number.

687125734 is a deficient number, since it is larger than the sum of its proper divisors (343562870).

687125734 is a wasteful number, since it uses less digits than its factorization.

687125734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343562869.

The product of its digits is 282240, while the sum is 43.

The square root of 687125734 is about 26213.0832600822. The cubic root of 687125734 is about 882.4268984755.

The spelling of 687125734 in words is "six hundred eighty-seven million, one hundred twenty-five thousand, seven hundred thirty-four".