28130556 has 24 divisors (see below), whose sum is σ = 65926224. Its totient is φ = 9335680.

The previous prime is 28130549. The next prime is 28130579. The reversal of 28130556 is 65503182.

It is a congruent number.

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, 2235 + ... + 7826.

It is an arithmetic number, because the mean of its divisors is an integer number (2746926).

Almost surely, 2^28130556 is an apocalyptic number.

It is an amenable number.

28130556 is an abundant number, since it is smaller than the sum of its proper divisors (37795668).

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

28130556 is a wasteful number, since it uses less digits than its factorization.

28130556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10301 (or 10299 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 28130556 is about 5303.8246577352. The cubic root of 28130556 is about 304.1301237723.

The spelling of 28130556 in words is "twenty-eight million, one hundred thirty thousand, five hundred fifty-six".