28115556 has 48 divisors (see below), whose sum is σ = 75245184. Its totient is φ = 8004096.

The previous prime is 28115533. The next prime is 28115557. The reversal of 28115556 is 65551182.

It is not an unprimeable number, because it can be changed into a prime (28115557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35986 + ... + 36758.

It is an arithmetic number, because the mean of its divisors is an integer number (1567608).

Almost surely, 2^28115556 is an apocalyptic number.

It is an amenable number.

28115556 is an abundant number, since it is smaller than the sum of its proper divisors (47129628).

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

28115556 is a wasteful number, since it uses less digits than its factorization.

28115556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220 (or 1218 counting only the distinct ones).

The product of its digits is 12000, while the sum is 33.

The square root of 28115556 is about 5302.4103952825. The cubic root of 28115556 is about 304.0760572625.

The spelling of 28115556 in words is "twenty-eight million, one hundred fifteen thousand, five hundred fifty-six".