128732157 has 6 divisors (see below), whose sum is σ = 185946462. Its totient is φ = 85821432.

The previous prime is 128732141. The next prime is 128732171. The reversal of 128732157 is 751237821.

128732157 is a `hidden beast` number, since 1 + 287 + 321 + 57 = 666.

It can be written as a sum of positive squares in only one way, i.e., 128731716 + 441 = 11346^2 + 21^2 .

It is not a de Polignac number, because 128732157 - 2⁴ = 128732141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128732137) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7151778 + ... + 7151795.

It is an arithmetic number, because the mean of its divisors is an integer number (30991077).

Almost surely, 2^128732157 is an apocalyptic number.

It is an amenable number.

128732157 is a deficient number, since it is larger than the sum of its proper divisors (57214305).

128732157 is a wasteful number, since it uses less digits than its factorization.

128732157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14303579 (or 14303576 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 128732157 is about 11346.0194341452. The cubic root of 128732157 is about 504.9274895074.

Adding to 128732157 its reverse (751237821), we get a palindrome (879969978).

The spelling of 128732157 in words is "one hundred twenty-eight million, seven hundred thirty-two thousand, one hundred fifty-seven".