28240860 has 48 divisors (see below), whose sum is σ = 79323552. Its totient is φ = 7507200.

The previous prime is 28240837. The next prime is 28240909. The reversal of 28240860 is 6804282.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27150 + ... + 28170.

It is an arithmetic number, because the mean of its divisors is an integer number (1652574).

Almost surely, 2^28240860 is an apocalyptic number.

28240860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28240860 is an abundant number, since it is smaller than the sum of its proper divisors (51082692).

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

28240860 is a wasteful number, since it uses less digits than its factorization.

28240860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494 (or 1492 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 28240860 is about 5314.2130179360. The cubic root of 28240860 is about 304.5271181437.

The spelling of 28240860 in words is "twenty-eight million, two hundred forty thousand, eight hundred sixty".