28161299 has 8 divisors (see below), whose sum is σ = 30780288. Its totient is φ = 25649280.

The previous prime is 28161277. The next prime is 28161313. The reversal of 28161299 is 99216182.

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 28161299 - 2¹⁶ = 28095763 is a prime.

It is a super-2 number, since 2×28161299² = 1586117522734802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28161229) 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, 26192 + ... + 27245.

It is an arithmetic number, because the mean of its divisors is an integer number (3847536).

Almost surely, 2^28161299 is an apocalyptic number.

28161299 is a deficient number, since it is larger than the sum of its proper divisors (2618989).

28161299 is a wasteful number, since it uses less digits than its factorization.

28161299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53485.

The product of its digits is 15552, while the sum is 38.

The square root of 28161299 is about 5306.7220579186. The cubic root of 28161299 is about 304.2408748527.

The spelling of 28161299 in words is "twenty-eight million, one hundred sixty-one thousand, two hundred ninety-nine".