28267401285 has 12 divisors (see below), whose sum is σ = 48996828972. Its totient is φ = 15075947328.

The previous prime is 28267401271. The next prime is 28267401293. The reversal of 28267401285 is 58210476282.

It can be written as a sum of positive squares in 2 ways, for example, as 17374930596 + 10892470689 = 131814^2 + 104367^2 .

It is not a de Polignac number, because 28267401285 - 2⁴ = 28267401269 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 628164473 = 28267401285 / (2 + 8 + 2 + 6 + 7 + 4 + 0 + 1 + 2 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 28267401285.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 314082192 + ... + 314082281.

It is an arithmetic number, because the mean of its divisors is an integer number (4083069081).

Almost surely, 2^28267401285 is an apocalyptic number.

It is an amenable number.

28267401285 is a deficient number, since it is larger than the sum of its proper divisors (20729427687).

28267401285 is a wasteful number, since it uses less digits than its factorization.

28267401285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628164484 (or 628164481 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 28267401285 in words is "twenty-eight billion, two hundred sixty-seven million, four hundred one thousand, two hundred eighty-five".