28816407 has 24 divisors (see below), whose sum is σ = 44844800. Its totient is φ = 17772048.

The previous prime is 28816397. The next prime is 28816409. The reversal of 28816407 is 70461882.

28816407 is a `hidden beast` number, since 2 + 8 + 8 + 1 + 640 + 7 = 666.

It is not a de Polignac number, because 28816407 - 2¹⁸ = 28554263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28816409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5394 + ... + 9312.

Almost surely, 2^28816407 is an apocalyptic number.

28816407 is a deficient number, since it is larger than the sum of its proper divisors (16028393).

28816407 is a wasteful number, since it uses less digits than its factorization.

28816407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3987 (or 3984 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 28816407 is about 5368.0915603220. The cubic root of 28816407 is about 306.5819694948.

The spelling of 28816407 in words is "twenty-eight million, eight hundred sixteen thousand, four hundred seven".