28440290 has 16 divisors (see below), whose sum is σ = 51261120. Its totient is φ = 11360880.

The previous prime is 28440281. The next prime is 28440319. The reversal of 28440290 is 9204482.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8795 + ... + 11585.

It is an arithmetic number, because the mean of its divisors is an integer number (3203820).

Almost surely, 2^28440290 is an apocalyptic number.

28440290 is a deficient number, since it is larger than the sum of its proper divisors (22820830).

28440290 is a wasteful number, since it uses less digits than its factorization.

28440290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3817.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28440290 is about 5332.9438399443. The cubic root of 28440290 is about 305.2422692123.

The spelling of 28440290 in words is "twenty-eight million, four hundred forty thousand, two hundred ninety".