28031329 has 8 divisors (see below), whose sum is σ = 28683072. Its totient is φ = 27384240.

The previous prime is 28031321. The next prime is 28031369. The reversal of 28031329 is 92313082.

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 28031329 - 2³ = 28031321 is a prime.

It is a pancake number, because a pancake can be divided into 28031329 parts by 7487 straight cuts.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28031297 and 28031306.

It is not an unprimeable number, because it can be changed into a prime (28031321) 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, 12934 + ... + 14944.

It is an arithmetic number, because the mean of its divisors is an integer number (3585384).

Almost surely, 2^28031329 is an apocalyptic number.

It is an amenable number.

28031329 is a deficient number, since it is larger than the sum of its proper divisors (651743).

28031329 is a wasteful number, since it uses less digits than its factorization.

28031329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2327.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 28031329 is about 5294.4621067678. The cubic root of 28031329 is about 303.7721088978.

The spelling of 28031329 in words is "twenty-eight million, thirty-one thousand, three hundred twenty-nine".