28216394 has 16 divisors (see below), whose sum is σ = 43338240. Its totient is φ = 13774320.

The previous prime is 28216393. The next prime is 28216399. The reversal of 28216394 is 49361282.

It is not an unprimeable number, because it can be changed into a prime (28216393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14567 + ... + 16389.

It is an arithmetic number, because the mean of its divisors is an integer number (2708640).

Almost surely, 2^28216394 is an apocalyptic number.

28216394 is a deficient number, since it is larger than the sum of its proper divisors (15121846).

28216394 is a wasteful number, since it uses less digits than its factorization.

28216394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2005.

The product of its digits is 20736, while the sum is 35.

The square root of 28216394 is about 5311.9105790666. The cubic root of 28216394 is about 304.4391520659.

The spelling of 28216394 in words is "twenty-eight million, two hundred sixteen thousand, three hundred ninety-four".