28409867512 has 32 divisors (see below), whose sum is σ = 57459790080. Its totient is φ = 13090826880.

The previous prime is 28409867501. The next prime is 28409867527. The reversal of 28409867512 is 21576890482.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a self number, because there is not a number n which added to its sum of digits gives 28409867512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159064 + ... + 286567.

It is an arithmetic number, because the mean of its divisors is an integer number (1795618440).

Almost surely, 2^28409867512 is an apocalyptic number.

It is an amenable number.

28409867512 is an abundant number, since it is smaller than the sum of its proper divisors (29049922568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28409867512 is a wasteful number, since it uses less digits than its factorization.

28409867512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446263 (or 446259 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 52.

The spelling of 28409867512 in words is "twenty-eight billion, four hundred nine million, eight hundred sixty-seven thousand, five hundred twelve".