28004169 has 16 divisors (see below), whose sum is σ = 39021120. Its totient is φ = 17841600.

The previous prime is 28004161. The next prime is 28004209. The reversal of 28004169 is 96140082.

It is not a de Polignac number, because 28004169 - 2³ = 28004161 is a prime.

It is a super-2 number, since 2×28004169² = 1568466962761122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28004161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7194 + ... + 10380.

It is an arithmetic number, because the mean of its divisors is an integer number (2438820).

Almost surely, 2^28004169 is an apocalyptic number.

28004169 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28004169 is a deficient number, since it is larger than the sum of its proper divisors (11016951).

28004169 is a wasteful number, since it uses less digits than its factorization.

28004169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3320.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 28004169 is about 5291.8965409388. The cubic root of 28004169 is about 303.6739673199.

The spelling of 28004169 in words is "twenty-eight million, four thousand, one hundred sixty-nine".