731688157 has 12 divisors (see below), whose sum is σ = 783128736. Its totient is φ = 683391240.

The previous prime is 731688131. The next prime is 731688203. The reversal of 731688157 is 751886137.

It is a de Polignac number, because none of the positive numbers 2^k-731688157 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 (731688457) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11358 + ... + 39904.

It is an arithmetic number, because the mean of its divisors is an integer number (65260728).

Almost surely, 2^731688157 is an apocalyptic number.

It is an amenable number.

731688157 is a deficient number, since it is larger than the sum of its proper divisors (51440579).

731688157 is a wasteful number, since it uses less digits than its factorization.

731688157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28656 (or 28637 counting only the distinct ones).

The product of its digits is 282240, while the sum is 46.

The square root of 731688157 is about 27049.7348785529. The cubic root of 731688157 is about 901.1048804925.

The spelling of 731688157 in words is "seven hundred thirty-one million, six hundred eighty-eight thousand, one hundred fifty-seven".