28157169 has 8 divisors (see below), whose sum is σ = 37995552. Its totient is φ = 18545120.

The previous prime is 28157159. The next prime is 28157179. The reversal of 28157169 is 96175182.

It is an interprime number because it is at equal distance from previous prime (28157159) and next prime (28157179).

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

It is a cyclic number.

It is not a de Polignac number, because 28157169 - 2⁵ = 28157137 is a prime.

It is a super-2 number, since 2×28157169² = 1585652332189122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28157149) 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, 56292 + ... + 56789.

It is an arithmetic number, because the mean of its divisors is an integer number (4749444).

Almost surely, 2^28157169 is an apocalyptic number.

It is an amenable number.

28157169 is a deficient number, since it is larger than the sum of its proper divisors (9838383).

28157169 is a wasteful number, since it uses less digits than its factorization.

28157169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113167.

The product of its digits is 30240, while the sum is 39.

The square root of 28157169 is about 5306.3329145465. The cubic root of 28157169 is about 304.2260012935.

The spelling of 28157169 in words is "twenty-eight million, one hundred fifty-seven thousand, one hundred sixty-nine".