28291056 has 40 divisors (see below), whose sum is σ = 73281024. Its totient is φ = 9405120.

The previous prime is 28291013. The next prime is 28291063. The reversal of 28291056 is 65019282.

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 7 ways as a sum of consecutive naturals, for example, 28651 + ... + 29621.

Almost surely, 2^28291056 is an apocalyptic number.

It is an amenable number.

28291056 is an abundant number, since it is smaller than the sum of its proper divisors (44989968).

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

28291056 is a wasteful number, since it uses less digits than its factorization.

28291056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1589 (or 1583 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 28291056 is about 5318.9337277315. The cubic root of 28291056 is about 304.7074360184.

The spelling of 28291056 in words is "twenty-eight million, two hundred ninety-one thousand, fifty-six".