28808290 has 32 divisors (see below), whose sum is σ = 59460480. Its totient is φ = 9844224.

The previous prime is 28808261. The next prime is 28808293. The reversal of 28808290 is 9280882.

It is a super-3 number, since 3×28808290³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (28808293) 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 15 ways as a sum of consecutive naturals, for example, 30546 + ... + 31474.

It is an arithmetic number, because the mean of its divisors is an integer number (1858140).

Almost surely, 2^28808290 is an apocalyptic number.

28808290 is an abundant number, since it is smaller than the sum of its proper divisors (30652190).

28808290 is a wasteful number, since it uses less digits than its factorization.

28808290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 28808290 is about 5367.3354655732. The cubic root of 28808290 is about 306.5531808081.

The spelling of 28808290 in words is "twenty-eight million, eight hundred eight thousand, two hundred ninety".