28090830 has 16 divisors (see below), whose sum is σ = 67418064. Its totient is φ = 7490880.

The previous prime is 28090823. The next prime is 28090831. The reversal of 28090830 is 3809082.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 936361 = 28090830 / (2 + 8 + 0 + 9 + 0 + 8 + 3 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28090831) 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 7 ways as a sum of consecutive naturals, for example, 468151 + ... + 468210.

It is an arithmetic number, because the mean of its divisors is an integer number (4213629).

Almost surely, 2^28090830 is an apocalyptic number.

28090830 is an abundant number, since it is smaller than the sum of its proper divisors (39327234).

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

28090830 is a wasteful number, since it uses less digits than its factorization.

28090830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936371.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 28090830 is about 5300.0783013084. The cubic root of 28090830 is about 303.9868920364.

It can be divided in two parts, 28090 and 830, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 28090830 in words is "twenty-eight million, ninety thousand, eight hundred thirty".