28111455 has 48 divisors (see below), whose sum is σ = 53542944. Its totient is φ = 14100480.

The previous prime is 28111417. The next prime is 28111459. The reversal of 28111455 is 55411182.

It is not a de Polignac number, because 28111455 - 2¹⁰ = 28110431 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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 (28111459) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19975 + ... + 21335.

It is an arithmetic number, because the mean of its divisors is an integer number (1115478).

Almost surely, 2^28111455 is an apocalyptic number.

28111455 is a deficient number, since it is larger than the sum of its proper divisors (25431489).

28111455 is a wasteful number, since it uses less digits than its factorization.

28111455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398 (or 1386 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

The square root of 28111455 is about 5302.0236702603. The cubic root of 28111455 is about 304.0612721313.

The spelling of 28111455 in words is "twenty-eight million, one hundred eleven thousand, four hundred fifty-five".