28157136 has 80 divisors (see below), whose sum is σ = 84946944. Its totient is φ = 7869312.

The previous prime is 28157123. The next prime is 28157137. The reversal of 28157136 is 63175182.

It is a junction number, because it is equal to n+sod(n) for n = 28157097 and 28157106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28157137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14901 + ... + 16683.

Almost surely, 2^28157136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28157136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42473472).

28157136 is an abundant number, since it is smaller than the sum of its proper divisors (56789808).

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

28157136 is a wasteful number, since it uses less digits than its factorization.

28157136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1848 (or 1842 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 28157136 is about 5306.3298050536. The cubic root of 28157136 is about 304.2258824432.

The spelling of 28157136 in words is "twenty-eight million, one hundred fifty-seven thousand, one hundred thirty-six".