28363917 has 4 divisors (see below), whose sum is σ = 37818560. Its totient is φ = 18909276.

The previous prime is 28363913. The next prime is 28363919. The reversal of 28363917 is 71936382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28363917 - 2² = 28363913 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 (28363913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4727317 + ... + 4727322.

It is an arithmetic number, because the mean of its divisors is an integer number (9454640).

Almost surely, 2^28363917 is an apocalyptic number.

It is an amenable number.

28363917 is a deficient number, since it is larger than the sum of its proper divisors (9454643).

28363917 is an equidigital number, since it uses as much as digits as its factorization.

28363917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9454642.

The product of its digits is 54432, while the sum is 39.

The square root of 28363917 is about 5325.7785346370. The cubic root of 28363917 is about 304.9687937256.

The spelling of 28363917 in words is "twenty-eight million, three hundred sixty-three thousand, nine hundred seventeen".