28303919 has 12 divisors (see below), whose sum is σ = 33037200. Its totient is φ = 24177888.

The previous prime is 28303903. The next prime is 28303943. The reversal of 28303919 is 91930382.

It is not a de Polignac number, because 28303919 - 2⁴ = 28303903 is a prime.

It is a super-2 number, since 2×28303919² = 1602223661517122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28303999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16787 + ... + 18395.

It is an arithmetic number, because the mean of its divisors is an integer number (2753100).

Almost surely, 2^28303919 is an apocalyptic number.

28303919 is a deficient number, since it is larger than the sum of its proper divisors (4733281).

28303919 is a wasteful number, since it uses less digits than its factorization.

28303919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1982 (or 1975 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 28303919 is about 5320.1427612424. The cubic root of 28303919 is about 304.7536091256.

The spelling of 28303919 in words is "twenty-eight million, three hundred three thousand, nine hundred nineteen".