28165788 has 72 divisors (see below), whose sum is σ = 83064800. Its totient is φ = 8043840.

The previous prime is 28165759. The next prime is 28165789. The reversal of 28165788 is 88756182.

It is a super-2 number, since 2×28165788² = 1586623227321888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28165789) 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, 11208 + ... + 13488.

Almost surely, 2^28165788 is an apocalyptic number.

28165788 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28165788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41532400).

28165788 is an abundant number, since it is smaller than the sum of its proper divisors (54899012).

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

28165788 is a wasteful number, since it uses less digits than its factorization.

28165788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312 (or 2293 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 28165788 is about 5307.1449951928. The cubic root of 28165788 is about 304.2570396459.

The spelling of 28165788 in words is "twenty-eight million, one hundred sixty-five thousand, seven hundred eighty-eight".