157928709 has 4 divisors (see below), whose sum is σ = 210571616. Its totient is φ = 105285804.

The previous prime is 157928699. The next prime is 157928713. The reversal of 157928709 is 907829751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 907829751 = 3 ⋅302609917.

It is not a de Polignac number, because 157928709 - 2²³ = 149540101 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 (157928509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26321449 + ... + 26321454.

It is an arithmetic number, because the mean of its divisors is an integer number (52642904).

Almost surely, 2^157928709 is an apocalyptic number.

It is an amenable number.

157928709 is a deficient number, since it is larger than the sum of its proper divisors (52642907).

157928709 is an equidigital number, since it uses as much as digits as its factorization.

157928709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52642906.

The product of its (nonzero) digits is 317520, while the sum is 48.

The square root of 157928709 is about 12566.9689663021. The cubic root of 157928709 is about 540.5306956986.

The spelling of 157928709 in words is "one hundred fifty-seven million, nine hundred twenty-eight thousand, seven hundred nine".