28161123 has 8 divisors (see below), whose sum is σ = 37920336. Its totient is φ = 18588000.

The previous prime is 28161103. The next prime is 28161139. The reversal of 28161123 is 32116182.

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

It is not a de Polignac number, because 28161123 - 2⁹ = 28160611 is a prime.

It is a super-2 number, since 2×28161123² = 1586097697242258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28161093 and 28161102.

It is not an unprimeable number, because it can be changed into a prime (28161103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46168 + ... + 46773.

It is an arithmetic number, because the mean of its divisors is an integer number (4740042).

Almost surely, 2^28161123 is an apocalyptic number.

28161123 is a deficient number, since it is larger than the sum of its proper divisors (9759213).

28161123 is a wasteful number, since it uses less digits than its factorization.

28161123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93045.

The product of its digits is 576, while the sum is 24.

The square root of 28161123 is about 5306.7054751512. The cubic root of 28161123 is about 304.2402410454.

The spelling of 28161123 in words is "twenty-eight million, one hundred sixty-one thousand, one hundred twenty-three".