28051331 has 8 divisors (see below), whose sum is σ = 34973184. Its totient is φ = 21858120.

The previous prime is 28051327. The next prime is 28051369. The reversal of 28051331 is 13315082.

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 28051331 - 2² = 28051327 is a prime.

It is a super-2 number, since 2×28051331² = 1573754341743122, 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 = 28051297 and 28051306.

It is not an unprimeable number, because it can be changed into a prime (28051031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182075 + ... + 182228.

It is an arithmetic number, because the mean of its divisors is an integer number (4371648).

Almost surely, 2^28051331 is an apocalyptic number.

28051331 is a deficient number, since it is larger than the sum of its proper divisors (6921853).

28051331 is a wasteful number, since it uses less digits than its factorization.

28051331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364321.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 28051331 is about 5296.3507247916. The cubic root of 28051331 is about 303.8443448008.

It can be divided in two parts, 28051 and 331, that added together give a palindrome (28382).

The spelling of 28051331 in words is "twenty-eight million, fifty-one thousand, three hundred thirty-one".