157797689 has 12 divisors (see below), whose sum is σ = 194359284. Its totient is φ = 127298304.

The previous prime is 157797677. The next prime is 157797697. The reversal of 157797689 is 986797751.

It can be written as a sum of positive squares in 2 ways, for example, as 137475625 + 20322064 = 11725^2 + 4508^2 .

It is not a de Polignac number, because 157797689 - 2⁸ = 157797433 is a prime.

It is a super-2 number, since 2×157797689² = 49800221307481442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (157797649) 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, 93884 + ... + 95549.

It is an arithmetic number, because the mean of its divisors is an integer number (16196607).

Almost surely, 2^157797689 is an apocalyptic number.

It is an amenable number.

157797689 is a deficient number, since it is larger than the sum of its proper divisors (36561595).

157797689 is a wasteful number, since it uses less digits than its factorization.

157797689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189464 (or 189457 counting only the distinct ones).

The product of its digits is 6667920, while the sum is 59.

The square root of 157797689 is about 12561.7550127361. The cubic root of 157797689 is about 540.3811769151.

The spelling of 157797689 in words is "one hundred fifty-seven million, seven hundred ninety-seven thousand, six hundred eighty-nine".