28255288 has 8 divisors (see below), whose sum is σ = 52978680. Its totient is φ = 14127640.

The previous prime is 28255267. The next prime is 28255289. The reversal of 28255288 is 88255282.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×28255288² = 1596722599925888, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28255288.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28255289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1765948 + ... + 1765963.

It is an arithmetic number, because the mean of its divisors is an integer number (6622335).

Almost surely, 2^28255288 is an apocalyptic number.

It is an amenable number.

28255288 is a deficient number, since it is larger than the sum of its proper divisors (24723392).

28255288 is a wasteful number, since it uses less digits than its factorization.

28255288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3531917 (or 3531913 counting only the distinct ones).

The product of its digits is 102400, while the sum is 40.

The square root of 28255288 is about 5315.5703362857. The cubic root of 28255288 is about 304.5789693649.

The spelling of 28255288 in words is "twenty-eight million, two hundred fifty-five thousand, two hundred eighty-eight".