28120519 has 4 divisors (see below), whose sum is σ = 32137744. Its totient is φ = 24103296.

The previous prime is 28120511. The next prime is 28120577. The reversal of 28120519 is 91502182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91502182 = 2 ⋅45751091.

It is not a de Polignac number, because 28120519 - 2³ = 28120511 is a prime.

It is a super-2 number, since 2×28120519² = 1581527177658722, 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 (28120511) 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, 2008602 + ... + 2008615.

It is an arithmetic number, because the mean of its divisors is an integer number (8034436).

Almost surely, 2^28120519 is an apocalyptic number.

28120519 is a deficient number, since it is larger than the sum of its proper divisors (4017225).

28120519 is an equidigital number, since it uses as much as digits as its factorization.

28120519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4017224.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 28120519 is about 5302.8783693387. The cubic root of 28120519 is about 304.0939481966.

The spelling of 28120519 in words is "twenty-eight million, one hundred twenty thousand, five hundred nineteen".