28861329 has 16 divisors (see below), whose sum is σ = 44183552. Its totient is φ = 16415568.

The previous prime is 28861319. The next prime is 28861331. The reversal of 28861329 is 92316882.

It is a happy number.

It is not a de Polignac number, because 28861329 - 2⁷ = 28861201 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28861319) 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, 1602 + ... + 7764.

It is an arithmetic number, because the mean of its divisors is an integer number (2761472).

Almost surely, 2^28861329 is an apocalyptic number.

It is an amenable number.

28861329 is a deficient number, since it is larger than the sum of its proper divisors (15322223).

28861329 is a wasteful number, since it uses less digits than its factorization.

28861329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6396.

The product of its digits is 41472, while the sum is 39.

The square root of 28861329 is about 5372.2740994852. The cubic root of 28861329 is about 306.7411973597.

The spelling of 28861329 in words is "twenty-eight million, eight hundred sixty-one thousand, three hundred twenty-nine".