28390260 has 48 divisors (see below), whose sum is σ = 79833600. Its totient is φ = 7538304.

The previous prime is 28390259. The next prime is 28390267. The reversal of 28390260 is 6209382.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28390267) 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, 15261 + ... + 17019.

It is an arithmetic number, because the mean of its divisors is an integer number (1663200).

Almost surely, 2^28390260 is an apocalyptic number.

28390260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28390260 is an abundant number, since it is smaller than the sum of its proper divisors (51443340).

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

28390260 is a wasteful number, since it uses less digits than its factorization.

28390260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040 (or 2038 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 28390260 is about 5328.2511202082. The cubic root of 28390260 is about 305.0631778109.

The spelling of 28390260 in words is "twenty-eight million, three hundred ninety thousand, two hundred sixty".