28816931 has 8 divisors (see below), whose sum is σ = 33855024. Its totient is φ = 24181920.

The previous prime is 28816927. The next prime is 28816937. The reversal of 28816931 is 13961882.

28816931 = 164² + 165² + ... + 449².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28816931 - 2² = 28816927 is a prime.

It is a super-2 number, since 2×28816931² = 1660831024517522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28816937) 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, 100616 + ... + 100901.

It is an arithmetic number, because the mean of its divisors is an integer number (4231878).

Almost surely, 2^28816931 is an apocalyptic number.

28816931 is a deficient number, since it is larger than the sum of its proper divisors (5038093).

28816931 is a wasteful number, since it uses less digits than its factorization.

28816931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201541.

The product of its digits is 20736, while the sum is 38.

The square root of 28816931 is about 5368.1403670172. The cubic root of 28816931 is about 306.5838277878.

The spelling of 28816931 in words is "twenty-eight million, eight hundred sixteen thousand, nine hundred thirty-one".