28039619 has 4 divisors (see below), whose sum is σ = 28185096. Its totient is φ = 27894144.

The previous prime is 28039603. The next prime is 28039621. The reversal of 28039619 is 91693082.

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 28039619 - 2⁴ = 28039603 is a prime.

It is a super-2 number, since 2×28039619² = 1572440467330322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28039639) 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, 72449 + ... + 72834.

It is an arithmetic number, because the mean of its divisors is an integer number (7046274).

Almost surely, 2^28039619 is an apocalyptic number.

28039619 is a deficient number, since it is larger than the sum of its proper divisors (145477).

28039619 is a wasteful number, since it uses less digits than its factorization.

28039619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145476.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 28039619 is about 5295.2449423988. The cubic root of 28039619 is about 303.8020518541.

The spelling of 28039619 in words is "twenty-eight million, thirty-nine thousand, six hundred nineteen".