28861161 has 8 divisors (see below), whose sum is σ = 43978944. Its totient is φ = 16492080.

The previous prime is 28861141. The next prime is 28861163. The reversal of 28861161 is 16116882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28861161 - 2¹⁷ = 28730089 is a prime.

It is a super-2 number, since 2×28861161² = 1665933228535842, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28861163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 687150 + ... + 687191.

It is an arithmetic number, because the mean of its divisors is an integer number (5497368).

Almost surely, 2^28861161 is an apocalyptic number.

28861161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28861161 is a deficient number, since it is larger than the sum of its proper divisors (15117783).

28861161 is a wasteful number, since it uses less digits than its factorization.

28861161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1374351.

The product of its digits is 4608, while the sum is 33.

The square root of 28861161 is about 5372.2584636259. The cubic root of 28861161 is about 306.7406021847.

The spelling of 28861161 in words is "twenty-eight million, eight hundred sixty-one thousand, one hundred sixty-one".