28279619 has 8 divisors (see below), whose sum is σ = 31519440. Its totient is φ = 25214976.

The previous prime is 28279609. The next prime is 28279633. The reversal of 28279619 is 91697282.

It is a happy number.

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

It is not a de Polignac number, because 28279619 - 2¹⁶ = 28214083 is a prime.

It is a super-2 number, since 2×28279619² = 1599473701570322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28279619.

It is not an unprimeable number, because it can be changed into a prime (28279609) 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, 43454 + ... + 44099.

It is an arithmetic number, because the mean of its divisors is an integer number (3939930).

Almost surely, 2^28279619 is an apocalyptic number.

28279619 is a deficient number, since it is larger than the sum of its proper divisors (3239821).

28279619 is a wasteful number, since it uses less digits than its factorization.

28279619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87589.

The product of its digits is 108864, while the sum is 44.

The square root of 28279619 is about 5317.8584975533. The cubic root of 28279619 is about 304.6663699342. Note that the first 3 decimals are identical.

It can be divided in two parts, 282796 and 19, that multiplied together give a square (5373124 = 2318²).

The spelling of 28279619 in words is "twenty-eight million, two hundred seventy-nine thousand, six hundred nineteen".