13157128 has 8 divisors (see below), whose sum is σ = 24669630. Its totient is φ = 6578560.

The previous prime is 13157119. The next prime is 13157129. The reversal of 13157128 is 82175131.

It can be written as a sum of positive squares in only one way, i.e., 7387524 + 5769604 = 2718^2 + 2402^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×13157128² = 346220034416768, which contains 22 as substring.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 13157096 and 13157105.

It is not an unprimeable number, because it can be changed into a prime (13157129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822313 + ... + 822328.

Almost surely, 2^13157128 is an apocalyptic number.

It is an amenable number.

13157128 is a deficient number, since it is larger than the sum of its proper divisors (11512502).

13157128 is a wasteful number, since it uses less digits than its factorization.

13157128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644647 (or 1644643 counting only the distinct ones).

The product of its digits is 1680, while the sum is 28.

The square root of 13157128 is about 3627.2755616302. The cubic root of 13157128 is about 236.0770121163.

The spelling of 13157128 in words is "thirteen million, one hundred fifty-seven thousand, one hundred twenty-eight".