728657157 has 8 divisors (see below), whose sum is σ = 972199584. Its totient is φ = 485443088.

The previous prime is 728657141. The next prime is 728657159. The reversal of 728657157 is 751756827.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 728657157 - 2⁴ = 728657141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728657159) 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, 76863 + ... + 85820.

It is an arithmetic number, because the mean of its divisors is an integer number (121524948).

Almost surely, 2^728657157 is an apocalyptic number.

It is an amenable number.

728657157 is a deficient number, since it is larger than the sum of its proper divisors (243542427).

728657157 is a wasteful number, since it uses less digits than its factorization.

728657157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164179.

The product of its digits is 823200, while the sum is 48.

The square root of 728657157 is about 26993.6503089152. The cubic root of 728657157 is about 899.8588902224.

The spelling of 728657157 in words is "seven hundred twenty-eight million, six hundred fifty-seven thousand, one hundred fifty-seven".