28000051 has 4 divisors (see below), whose sum is σ = 28965600. Its totient is φ = 27034504.

The previous prime is 28000031. The next prime is 28000061. The reversal of 28000051 is 15000082.

It is a happy number.

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 28000051 - 2⁵ = 28000019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27999989 and 28000034.

It is not an unprimeable number, because it can be changed into a prime (28000031) 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, 482731 + ... + 482788.

It is an arithmetic number, because the mean of its divisors is an integer number (7241400).

Almost surely, 2^28000051 is an apocalyptic number.

28000051 is a deficient number, since it is larger than the sum of its proper divisors (965549).

28000051 is an equidigital number, since it uses as much as digits as its factorization.

28000051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965548.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 28000051 is about 5291.5074411740. The cubic root of 28000051 is about 303.6590815518.

The spelling of 28000051 in words is "twenty-eight million, fifty-one", and thus it is an aban number and an uban number.