28531802270285 has 32 divisors (see below), whose sum is σ = 34895746595808. Its totient is φ = 22392109235200.

The previous prime is 28531802270161. The next prime is 28531802270287. The reversal of 28531802270285 is 58207220813582.

It can be written as a sum of positive squares in 16 ways, for example, as 7285178597449 + 21246623672836 = 2699107^2 + 4609406^2 .

It is not a de Polignac number, because 28531802270285 - 2⁴⁴ = 10939616225869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28531802270287) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25040639 + ... + 26155251.

It is an arithmetic number, because the mean of its divisors is an integer number (1090492081119).

Almost surely, 2^{28531802270285} is an apocalyptic number.

It is an amenable number.

28531802270285 is a deficient number, since it is larger than the sum of its proper divisors (6363944325523).

28531802270285 is a wasteful number, since it uses less digits than its factorization.

28531802270285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115185.

The product of its (nonzero) digits is 4300800, while the sum is 53.

The spelling of 28531802270285 in words is "twenty-eight trillion, five hundred thirty-one billion, eight hundred two million, two hundred seventy thousand, two hundred eighty-five".