28512019 has 8 divisors (see below), whose sum is σ = 29981952. Its totient is φ = 27061320.

The previous prime is 28512013. The next prime is 28512023. The reversal of 28512019 is 91021582.

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

It is a cyclic number.

It is not a de Polignac number, because 28512019 - 2⁷ = 28511891 is a prime.

It is a super-2 number, since 2×28512019² = 1625870454912722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28512013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1719 + ... + 7744.

It is an arithmetic number, because the mean of its divisors is an integer number (3747744).

Almost surely, 2^28512019 is an apocalyptic number.

28512019 is a deficient number, since it is larger than the sum of its proper divisors (1469933).

28512019 is a wasteful number, since it uses less digits than its factorization.

28512019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9617.

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

The square root of 28512019 is about 5339.6646898471. The cubic root of 28512019 is about 305.4986700396.

The spelling of 28512019 in words is "twenty-eight million, five hundred twelve thousand, nineteen".