28786290 has 64 divisors (see below), whose sum is σ = 76833792. Its totient is φ = 6854400.

The previous prime is 28786283. The next prime is 28786301. The reversal of 28786290 is 9268782.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10900 + ... + 13280.

It is an arithmetic number, because the mean of its divisors is an integer number (1200528).

Almost surely, 2^28786290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28786290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38416896).

28786290 is an abundant number, since it is smaller than the sum of its proper divisors (48047502).

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

28786290 is a wasteful number, since it uses less digits than its factorization.

28786290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2435.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 28786290 is about 5365.2856401127. The cubic root of 28786290 is about 306.4751258747.

The spelling of 28786290 in words is "twenty-eight million, seven hundred eighty-six thousand, two hundred ninety".