28165158 has 96 divisors (see below), whose sum is σ = 76737024. Its totient is φ = 7558272.

The previous prime is 28165157. The next prime is 28165169. The reversal of 28165158 is 85156182.

It is a super-2 number, since 2×28165158² = 1586552250329928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28165157) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 57591 + ... + 58077.

It is an arithmetic number, because the mean of its divisors is an integer number (799344).

Almost surely, 2^28165158 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28165158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38368512).

28165158 is an abundant number, since it is smaller than the sum of its proper divisors (48571866).

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

28165158 is a wasteful number, since it uses less digits than its factorization.

28165158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528 (or 516 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 28165158 is about 5307.0856409144. The cubic root of 28165158 is about 304.2547711329.

The spelling of 28165158 in words is "twenty-eight million, one hundred sixty-five thousand, one hundred fifty-eight".