28031269 has 8 divisors (see below), whose sum is σ = 32561408. Its totient is φ = 23632560.

The previous prime is 28031261. The next prime is 28031279. The reversal of 28031269 is 96213082.

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

It is not a de Polignac number, because 28031269 - 2³ = 28031261 is a prime.

It is a super-2 number, since 2×28031269² = 1571504083500722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28031269.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28031261) 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, 32397 + ... + 33250.

It is an arithmetic number, because the mean of its divisors is an integer number (4070176).

Almost surely, 2^28031269 is an apocalyptic number.

It is an amenable number.

28031269 is a deficient number, since it is larger than the sum of its proper divisors (4530139).

28031269 is an equidigital number, since it uses as much as digits as its factorization.

28031269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65715.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 28031269 is about 5294.4564404668. The cubic root of 28031269 is about 303.7718921601.

The spelling of 28031269 in words is "twenty-eight million, thirty-one thousand, two hundred sixty-nine".