28191316 has 24 divisors (see below), whose sum is σ = 50760864. Its totient is φ = 13692000.

The previous prime is 28191301. The next prime is 28191323. The reversal of 28191316 is 61319182.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42846 + ... + 43498.

It is an arithmetic number, because the mean of its divisors is an integer number (2115036).

Almost surely, 2^28191316 is an apocalyptic number.

It is an amenable number.

28191316 is a deficient number, since it is larger than the sum of its proper divisors (22569548).

28191316 is a wasteful number, since it uses less digits than its factorization.

28191316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951 (or 949 counting only the distinct ones).

The product of its digits is 2592, while the sum is 31.

The square root of 28191316 is about 5309.5495100809. The cubic root of 28191316 is about 304.3489327886.

The spelling of 28191316 in words is "twenty-eight million, one hundred ninety-one thousand, three hundred sixteen".