28817775 has 120 divisors (see below), whose sum is σ = 64817280. Its totient is φ = 12363840.

The previous prime is 28817759. The next prime is 28817777. The reversal of 28817775 is 57771882.

It is not a de Polignac number, because 28817775 - 2⁴ = 28817759 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28817775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28817777) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 269272 + ... + 269378.

It is an arithmetic number, because the mean of its divisors is an integer number (540144).

Almost surely, 2^28817775 is an apocalyptic number.

28817775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28817775 is an abundant number, since it is smaller than the sum of its proper divisors (35999505).

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

28817775 is a wasteful number, since it uses less digits than its factorization.

28817775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 141 counting only the distinct ones).

The product of its digits is 219520, while the sum is 45.

The square root of 28817775 is about 5368.2189783950. The cubic root of 28817775 is about 306.5868208688.

It can be divided in two parts, 28817 and 775, that added together give a palindrome (29592).

The spelling of 28817775 in words is "twenty-eight million, eight hundred seventeen thousand, seven hundred seventy-five".