28018719 has 12 divisors (see below), whose sum is σ = 40679496. Its totient is φ = 18583152.

The previous prime is 28018717. The next prime is 28018723. The reversal of 28018719 is 91781082.

It is not a de Polignac number, because 28018719 - 2¹ = 28018717 is a prime.

It is a super-2 number, since 2×28018719² = 1570097228801922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28018717) 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 11 ways as a sum of consecutive naturals, for example, 6129 + ... + 9674.

It is an arithmetic number, because the mean of its divisors is an integer number (3389958).

Almost surely, 2^28018719 is an apocalyptic number.

28018719 is a deficient number, since it is larger than the sum of its proper divisors (12660777).

28018719 is a wasteful number, since it uses less digits than its factorization.

28018719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16006 (or 16003 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 28018719 is about 5293.2711058475. The cubic root of 28018719 is about 303.7265510527.

The spelling of 28018719 in words is "twenty-eight million, eighteen thousand, seven hundred nineteen".