28726188 has 12 divisors (see below), whose sum is σ = 67027800. Its totient is φ = 9575392.

The previous prime is 28726177. The next prime is 28726189. The reversal of 28726188 is 88162782.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×28726188² = 1650387754022688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28726189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1196913 + ... + 1196936.

It is an arithmetic number, because the mean of its divisors is an integer number (5585650).

Almost surely, 2^28726188 is an apocalyptic number.

It is an amenable number.

28726188 is an abundant number, since it is smaller than the sum of its proper divisors (38301612).

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

28726188 is a wasteful number, since it uses less digits than its factorization.

28726188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2393856 (or 2393854 counting only the distinct ones).

The product of its digits is 86016, while the sum is 42.

The square root of 28726188 is about 5359.6817069673. The cubic root of 28726188 is about 306.2616839635.

The spelling of 28726188 in words is "twenty-eight million, seven hundred twenty-six thousand, one hundred eighty-eight".