28996290 has 48 divisors (see below), whose sum is σ = 75816000. Its totient is φ = 7688736.

The previous prime is 28996249. The next prime is 28996309. The reversal of 28996290 is 9269982.

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

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 17101 + ... + 18719.

It is an arithmetic number, because the mean of its divisors is an integer number (1579500).

Almost surely, 2^28996290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28996290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37908000).

28996290 is an abundant number, since it is smaller than the sum of its proper divisors (46819710).

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

28996290 is a wasteful number, since it uses less digits than its factorization.

28996290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831 (or 1828 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 28996290 is about 5384.8203312645. The cubic root of 28996290 is about 307.2185805209.

The spelling of 28996290 in words is "twenty-eight million, nine hundred ninety-six thousand, two hundred ninety".