28193919 has 8 divisors (see below), whose sum is σ = 40483632. Its totient is φ = 17350080.

The previous prime is 28193857. The next prime is 28193927. The reversal of 28193919 is 91939182.

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

It is not a de Polignac number, because 28193919 - 2¹⁵ = 28161151 is a prime.

It is a super-2 number, since 2×28193919² = 1589794137157122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28193969) 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, 361422 + ... + 361499.

It is an arithmetic number, because the mean of its divisors is an integer number (5060454).

Almost surely, 2^28193919 is an apocalyptic number.

28193919 is a deficient number, since it is larger than the sum of its proper divisors (12289713).

28193919 is a wasteful number, since it uses less digits than its factorization.

28193919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722937.

The product of its digits is 34992, while the sum is 42.

The square root of 28193919 is about 5309.7946287969. The cubic root of 28193919 is about 304.3582996907.

The spelling of 28193919 in words is "twenty-eight million, one hundred ninety-three thousand, nine hundred nineteen".