28319806 has 4 divisors (see below), whose sum is σ = 42479712. Its totient is φ = 14159902.

The previous prime is 28319789. The next prime is 28319813. The reversal of 28319806 is 60891382.

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

It is a super-2 number, since 2×28319806² = 1604022823755272, which contains 22 as substring.

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, 7079950 + ... + 7079953.

It is an arithmetic number, because the mean of its divisors is an integer number (10619928).

Almost surely, 2^28319806 is an apocalyptic number.

28319806 is a deficient number, since it is larger than the sum of its proper divisors (14159906).

28319806 is a wasteful number, since it uses less digits than its factorization.

28319806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14159905.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 28319806 is about 5321.6356508126. The cubic root of 28319806 is about 304.8106178976.

The spelling of 28319806 in words is "twenty-eight million, three hundred nineteen thousand, eight hundred six".