28927331 has 4 divisors (see below), whose sum is σ = 28996464. Its totient is φ = 28858200.

The previous prime is 28927321. The next prime is 28927361. The reversal of 28927331 is 13372982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28927331 - 2⁶ = 28927267 is a prime.

It is a super-2 number, since 2×28927331² = 1673580957567122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28927291 and 28927300.

It is not an unprimeable number, because it can be changed into a prime (28927321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33935 + ... + 34776.

It is an arithmetic number, because the mean of its divisors is an integer number (7249116).

Almost surely, 2^28927331 is an apocalyptic number.

28927331 is a deficient number, since it is larger than the sum of its proper divisors (69133).

28927331 is an equidigital number, since it uses as much as digits as its factorization.

28927331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69132.

The product of its digits is 18144, while the sum is 35.

The square root of 28927331 is about 5378.4134277685. The cubic root of 28927331 is about 306.9748447100.

The spelling of 28927331 in words is "twenty-eight million, nine hundred twenty-seven thousand, three hundred thirty-one".