28086406 has 4 divisors (see below), whose sum is σ = 42129612. Its totient is φ = 14043202.

The previous prime is 28086391. The next prime is 28086433. The reversal of 28086406 is 60468082.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7021600 + ... + 7021603.

It is an arithmetic number, because the mean of its divisors is an integer number (10532403).

Almost surely, 2^28086406 is an apocalyptic number.

28086406 is a deficient number, since it is larger than the sum of its proper divisors (14043206).

28086406 is a wasteful number, since it uses less digits than its factorization.

28086406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14043205.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 28086406 is about 5299.6609325503. The cubic root of 28086406 is about 303.9709329895.

The spelling of 28086406 in words is "twenty-eight million, eighty-six thousand, four hundred six".