28591919 has 2 divisors, whose sum is σ = 28591920. Its totient is φ = 28591918.

The previous prime is 28591907. The next prime is 28591939. The reversal of 28591919 is 91919582.

It is a happy number.

28591919 is nontrivially palindromic in base 13.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28591919 - 2²⁰ = 27543343 is a prime.

It is a super-2 number, since 2×28591919² = 1634995664205122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28591919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28591939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14295959 + 14295960.

It is an arithmetic number, because the mean of its divisors is an integer number (14295960).

Almost surely, 2^28591919 is an apocalyptic number.

28591919 is a deficient number, since it is larger than the sum of its proper divisors (1).

28591919 is an equidigital number, since it uses as much as digits as its factorization.

28591919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 44.

The square root of 28591919 is about 5347.1411988089. The cubic root of 28591919 is about 305.7837729428.

The spelling of 28591919 in words is "twenty-eight million, five hundred ninety-one thousand, nine hundred nineteen".