28699819 has 4 divisors (see below), whose sum is σ = 28722096. Its totient is φ = 28677544.

The previous prime is 28699813. The next prime is 28699843. The reversal of 28699819 is 91899682.

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

It is a cyclic number.

It is not a de Polignac number, because 28699819 - 2⁵ = 28699787 is a prime.

It is a super-2 number, since 2×28699819² = 1647359221265522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28699813) 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, 9079 + ... + 11824.

It is an arithmetic number, because the mean of its divisors is an integer number (7180524).

Almost surely, 2^28699819 is an apocalyptic number.

28699819 is a deficient number, since it is larger than the sum of its proper divisors (22277).

28699819 is a wasteful number, since it uses less digits than its factorization.

28699819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22276.

The product of its digits is 559872, while the sum is 52.

The square root of 28699819 is about 5357.2212013319. The cubic root of 28699819 is about 306.1679450303.

The spelling of 28699819 in words is "twenty-eight million, six hundred ninety-nine thousand, eight hundred nineteen".