28161056 has 72 divisors (see below), whose sum is σ = 69713280. Its totient is φ = 10961280.

The previous prime is 28161041. The next prime is 28161071. The reversal of 28161056 is 65016182.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28161041) and next prime (28161071).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26585 + ... + 27623.

It is an arithmetic number, because the mean of its divisors is an integer number (968240).

Almost surely, 2^28161056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28161056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34856640).

28161056 is an abundant number, since it is smaller than the sum of its proper divisors (41552224).

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

28161056 is a wasteful number, since it uses less digits than its factorization.

28161056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078 (or 1059 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 28161056 is about 5306.6991623796. The cubic root of 28161056 is about 304.2399997658.

The spelling of 28161056 in words is "twenty-eight million, one hundred sixty-one thousand, fifty-six".