128257157 has 12 divisors (see below), whose sum is σ = 149577120. Its totient is φ = 109654776.

The previous prime is 128257141. The next prime is 128257159. The reversal of 128257157 is 751752821.

It is not a de Polignac number, because 128257157 - 2⁴ = 128257141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128257157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128257159) 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, 17408 + ... + 23654.

It is an arithmetic number, because the mean of its divisors is an integer number (12464760).

Almost surely, 2^128257157 is an apocalyptic number.

It is an amenable number.

128257157 is a deficient number, since it is larger than the sum of its proper divisors (21319963).

128257157 is an equidigital number, since it uses as much as digits as its factorization.

128257157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6680 (or 6673 counting only the distinct ones).

The product of its digits is 39200, while the sum is 38.

The square root of 128257157 is about 11325.0676377671. The cubic root of 128257157 is about 504.3056916087.

The spelling of 128257157 in words is "one hundred twenty-eight million, two hundred fifty-seven thousand, one hundred fifty-seven".