28130840 has 32 divisors (see below), whose sum is σ = 66048480. Its totient is φ = 10762752.

The previous prime is 28130833. The next prime is 28130867. The reversal of 28130840 is 4803182.

It is a congruent number.

It is an unprimeable number.

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, 14369 + ... + 16208.

It is an arithmetic number, because the mean of its divisors is an integer number (2064015).

Almost surely, 2^28130840 is an apocalyptic number.

28130840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28130840 is an abundant number, since it is smaller than the sum of its proper divisors (37917640).

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

28130840 is a wasteful number, since it uses less digits than its factorization.

28130840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30611 (or 30607 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 28130840 is about 5303.8514308001. The cubic root of 28130840 is about 304.1311472462.

The spelling of 28130840 in words is "twenty-eight million, one hundred thirty thousand, eight hundred forty".