28519069 has 4 divisors (see below), whose sum is σ = 28541980. Its totient is φ = 28496160.

The previous prime is 28519063. The next prime is 28519097. The reversal of 28519069 is 96091582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20884900 + 7634169 = 4570^2 + 2763^2 .

It is a cyclic number.

It is not a de Polignac number, because 28519069 - 2⁵ = 28519037 is a prime.

It is a super-2 number, since 2×28519069² = 1626674593253522, 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 (28519063) 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, 9474 + ... + 12115.

It is an arithmetic number, because the mean of its divisors is an integer number (7135495).

Almost surely, 2^28519069 is an apocalyptic number.

It is an amenable number.

28519069 is a deficient number, since it is larger than the sum of its proper divisors (22911).

28519069 is a wasteful number, since it uses less digits than its factorization.

28519069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22910.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 28519069 is about 5340.3248028561. The cubic root of 28519069 is about 305.5238475870.

The spelling of 28519069 in words is "twenty-eight million, five hundred nineteen thousand, sixty-nine".