8157128 has 24 divisors (see below), whose sum is σ = 17792550. Its totient is φ = 3495744.

The previous prime is 8157113. The next prime is 8157133. The reversal of 8157128 is 8217518.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7606564 + 550564 = 2758^2 + 742^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8157094 and 8157103.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10013 + ... + 10796.

Almost surely, 2^8157128 is an apocalyptic number.

It is an amenable number.

8157128 is an abundant number, since it is smaller than the sum of its proper divisors (9635422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8157128 is a wasteful number, since it uses less digits than its factorization.

8157128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20829 (or 20818 counting only the distinct ones).

The product of its digits is 4480, while the sum is 32.

The square root of 8157128 is about 2856.0686266265. The cubic root of 8157128 is about 201.3009196925.

The spelling of 8157128 in words is "eight million, one hundred fifty-seven thousand, one hundred twenty-eight".