157628081 has 4 divisors (see below), whose sum is σ = 169753332. Its totient is φ = 145502832.

The previous prime is 157628077. The next prime is 157628089. The reversal of 157628081 is 180826751.

157628081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62663056 + 94965025 = 7916^2 + 9745^2 .

It is a cyclic number.

It is not a de Polignac number, because 157628081 - 2² = 157628077 is a prime.

It is a super-2 number, since 2×157628081² = 49693223839485122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157628089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6062606 + ... + 6062631.

It is an arithmetic number, because the mean of its divisors is an integer number (42438333).

Almost surely, 2^157628081 is an apocalyptic number.

It is an amenable number.

157628081 is a deficient number, since it is larger than the sum of its proper divisors (12125251).

157628081 is a wasteful number, since it uses less digits than its factorization.

157628081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12125250.

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 157628081 is about 12555.0022301870. The cubic root of 157628081 is about 540.1874989037.

The spelling of 157628081 in words is "one hundred fifty-seven million, six hundred twenty-eight thousand, eighty-one".