28290056 has 8 divisors (see below), whose sum is σ = 53043870. Its totient is φ = 14145024.

The previous prime is 28290047. The next prime is 28290061. The reversal of 28290056 is 65009282.

It can be written as a sum of positive squares in only one way, i.e., 26357956 + 1932100 = 5134^2 + 1390^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1768121 + ... + 1768136.

Almost surely, 2^28290056 is an apocalyptic number.

It is an amenable number.

28290056 is a deficient number, since it is larger than the sum of its proper divisors (24753814).

28290056 is a wasteful number, since it uses less digits than its factorization.

28290056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3536263 (or 3536259 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 28290056 is about 5318.8397230975. The cubic root of 28290056 is about 304.7038458257.

The spelling of 28290056 in words is "twenty-eight million, two hundred ninety thousand, fifty-six".