157728899 has 8 divisors (see below), whose sum is σ = 171386880. Its totient is φ = 144606600.

The previous prime is 157728863. The next prime is 157728931. The reversal of 157728899 is 998827751.

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 157728899 - 2⁸ = 157728643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157728829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133307 + ... + 134484.

It is an arithmetic number, because the mean of its divisors is an integer number (21423360).

Almost surely, 2^157728899 is an apocalyptic number.

157728899 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

157728899 is a deficient number, since it is larger than the sum of its proper divisors (13657981).

157728899 is a wasteful number, since it uses less digits than its factorization.

157728899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267841.

The product of its digits is 2540160, while the sum is 56.

The square root of 157728899 is about 12559.0166414413. The cubic root of 157728899 is about 540.3026412822.

The spelling of 157728899 in words is "one hundred fifty-seven million, seven hundred twenty-eight thousand, eight hundred ninety-nine".