28523919 has 8 divisors (see below), whose sum is σ = 38133760. Its totient is φ = 18965016.

The previous prime is 28523903. The next prime is 28523923. The reversal of 28523919 is 91932582.

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

It is not a de Polignac number, because 28523919 - 2⁴ = 28523903 is a prime.

It is a super-2 number, since 2×28523919² = 1627227910237122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28523939) 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, 11407 + ... + 13680.

It is an arithmetic number, because the mean of its divisors is an integer number (4766720).

Almost surely, 2^28523919 is an apocalyptic number.

28523919 is a deficient number, since it is larger than the sum of its proper divisors (9609841).

28523919 is a wasteful number, since it uses less digits than its factorization.

28523919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25469.

The product of its digits is 38880, while the sum is 39.

The square root of 28523919 is about 5340.7788757821. The cubic root of 28523919 is about 305.5411659021.

The spelling of 28523919 in words is "twenty-eight million, five hundred twenty-three thousand, nine hundred nineteen".