28870619 has 4 divisors (see below), whose sum is σ = 29650944. Its totient is φ = 28090296.

The previous prime is 28870603. The next prime is 28870627. The reversal of 28870619 is 91607882.

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 28870619 - 2⁴ = 28870603 is a prime.

It is a super-2 number, since 2×28870619² = 1667025282886322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28870649) 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, 390107 + ... + 390180.

It is an arithmetic number, because the mean of its divisors is an integer number (7412736).

Almost surely, 2^28870619 is an apocalyptic number.

28870619 is a deficient number, since it is larger than the sum of its proper divisors (780325).

28870619 is an equidigital number, since it uses as much as digits as its factorization.

28870619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780324.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 28870619 is about 5373.1386544551. The cubic root of 28870619 is about 306.7741055235.

It can be divided in two parts, 288 and 70619, that added together give a palindrome (70907).

The spelling of 28870619 in words is "twenty-eight million, eight hundred seventy thousand, six hundred nineteen".