28161956 has 12 divisors (see below), whose sum is σ = 49638960. Its totient is φ = 13979400.

The previous prime is 28161943. The next prime is 28161961. The reversal of 28161956 is 65916182.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24770 + ... + 25881.

It is an arithmetic number, because the mean of its divisors is an integer number (4136580).

Almost surely, 2^28161956 is an apocalyptic number.

It is an amenable number.

28161956 is a deficient number, since it is larger than the sum of its proper divisors (21477004).

28161956 is a wasteful number, since it uses less digits than its factorization.

28161956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50794 (or 50792 counting only the distinct ones).

The product of its digits is 25920, while the sum is 38.

The square root of 28161956 is about 5306.7839601778. The cubic root of 28161956 is about 304.2432408029.

The spelling of 28161956 in words is "twenty-eight million, one hundred sixty-one thousand, nine hundred fifty-six".