28181552 has 20 divisors (see below), whose sum is σ = 62402256. Its totient is φ = 12077760.

The previous prime is 28181551. The next prime is 28181557. The reversal of 28181552 is 25518182.

It is a happy number.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28181551) 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, 125699 + ... + 125922.

Almost surely, 2^28181552 is an apocalyptic number.

It is an amenable number.

28181552 is an abundant number, since it is smaller than the sum of its proper divisors (34220704).

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

28181552 is a wasteful number, since it uses less digits than its factorization.

28181552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251636 (or 251630 counting only the distinct ones).

The product of its digits is 6400, while the sum is 32.

The square root of 28181552 is about 5308.6299550826. The cubic root of 28181552 is about 304.3137918712.

The spelling of 28181552 in words is "twenty-eight million, one hundred eighty-one thousand, five hundred fifty-two".