28115136 has 168 divisors, whose sum is σ = 97210880. Its totient is φ = 7589376.

The previous prime is 28115119. The next prime is 28115137. The reversal of 28115136 is 63151182.

It is a tau number, because it is divible by the number of its divisors (168).

It is not an unprimeable number, because it can be changed into a prime (28115137) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76425 + ... + 76791.

Almost surely, 2^28115136 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 28115136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48605440).

28115136 is an abundant number, since it is smaller than the sum of its proper divisors (69095744).

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

28115136 is a wasteful number, since it uses less digits than its factorization.

28115136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411 (or 398 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 28115136 is about 5302.3707905049. The cubic root of 28115136 is about 304.0745431235.

The spelling of 28115136 in words is "twenty-eight million, one hundred fifteen thousand, one hundred thirty-six".