28818990 has 80 divisors (see below), whose sum is σ = 79244352. Its totient is φ = 7511616.

The previous prime is 28818989. The next prime is 28818997. The reversal of 28818990 is 9981882.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28818997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 37692 + ... + 38448.

Almost surely, 2^28818990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28818990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39622176).

28818990 is an abundant number, since it is smaller than the sum of its proper divisors (50425362).

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

28818990 is a wasteful number, since it uses less digits than its factorization.

28818990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823 (or 814 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 28818990 is about 5368.3321432266. The cubic root of 28818990 is about 306.5911295261.

The spelling of 28818990 in words is "twenty-eight million, eight hundred eighteen thousand, nine hundred ninety".