28243420724 has 6 divisors (see below), whose sum is σ = 49425986274. Its totient is φ = 14121710360.

The previous prime is 28243420669. The next prime is 28243420741. The reversal of 28243420724 is 42702434282.

It can be written as a sum of positive squares in only one way, i.e., 27782889124 + 460531600 = 166682^2 + 21460^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3530427587 + ... + 3530427594.

It is an arithmetic number, because the mean of its divisors is an integer number (8237664379).

Almost surely, 2^28243420724 is an apocalyptic number.

It is an amenable number.

28243420724 is a deficient number, since it is larger than the sum of its proper divisors (21182565550).

28243420724 is a wasteful number, since it uses less digits than its factorization.

28243420724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7060855185 (or 7060855183 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 38.

The spelling of 28243420724 in words is "twenty-eight billion, two hundred forty-three million, four hundred twenty thousand, seven hundred twenty-four".