28311255 has 32 divisors (see below), whose sum is σ = 57523200. Its totient is φ = 12941856.

The previous prime is 28311251. The next prime is 28311271. The reversal of 28311255 is 55211382.

It is a happy number.

It is not a de Polignac number, because 28311255 - 2² = 28311251 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28311251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14035 + ... + 15924.

It is an arithmetic number, because the mean of its divisors is an integer number (1797600).

Almost surely, 2^28311255 is an apocalyptic number.

28311255 is an abundant number, since it is smaller than the sum of its proper divisors (29211945).

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

28311255 is a wasteful number, since it uses less digits than its factorization.

28311255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29980 (or 29974 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 28311255 is about 5320.8321717566. The cubic root of 28311255 is about 304.7799362142.

The spelling of 28311255 in words is "twenty-eight million, three hundred eleven thousand, two hundred fifty-five".