28888390 has 16 divisors (see below), whose sum is σ = 52776432. Its totient is φ = 11382624.

The previous prime is 28888369. The next prime is 28888397. The reversal of 28888390 is 9388882.

It is a self number, because there is not a number n which added to its sum of digits gives 28888390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28888397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20889 + ... + 22228.

It is an arithmetic number, because the mean of its divisors is an integer number (3298527).

Almost surely, 2^28888390 is an apocalyptic number.

28888390 is a deficient number, since it is larger than the sum of its proper divisors (23888042).

28888390 is a wasteful number, since it uses less digits than its factorization.

28888390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43191.

The product of its (nonzero) digits is 221184, while the sum is 46.

The square root of 28888390 is about 5374.7920890021. The cubic root of 28888390 is about 306.8370364503.

The spelling of 28888390 in words is "twenty-eight million, eight hundred eighty-eight thousand, three hundred ninety".