28400083 has 4 divisors (see below), whose sum is σ = 28410928. Its totient is φ = 28389240.

The previous prime is 28400069. The next prime is 28400093. The reversal of 28400083 is 38000482.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28400083 - 2⁵ = 28400051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28400033) 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, 1213 + ... + 7633.

It is an arithmetic number, because the mean of its divisors is an integer number (7102732).

Almost surely, 2^28400083 is an apocalyptic number.

28400083 is a deficient number, since it is larger than the sum of its proper divisors (10845).

28400083 is an equidigital number, since it uses as much as digits as its factorization.

28400083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10844.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 28400083 is about 5329.1728251202. The cubic root of 28400083 is about 305.0983575997.

The spelling of 28400083 in words is "twenty-eight million, four hundred thousand, eighty-three".