157728506 has 16 divisors (see below), whose sum is σ = 263579400. Its totient is φ = 70287168.

The previous prime is 157728491. The next prime is 157728541. The reversal of 157728506 is 605827751.

It can be written as a sum of positive squares in 4 ways, for example, as 82646281 + 75082225 = 9091^2 + 8665^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103841 + ... + 105348.

Almost surely, 2^157728506 is an apocalyptic number.

157728506 is a deficient number, since it is larger than the sum of its proper divisors (105850894).

157728506 is a wasteful number, since it uses less digits than its factorization.

157728506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209233.

The product of its (nonzero) digits is 117600, while the sum is 41.

The square root of 157728506 is about 12559.0009953021. Note that the first 3 decimals coincide. The cubic root of 157728506 is about 540.3021925394.

The spelling of 157728506 in words is "one hundred fifty-seven million, seven hundred twenty-eight thousand, five hundred six".