28285645884 has 12 divisors (see below), whose sum is σ = 65999840424. Its totient is φ = 9428548624.

The previous prime is 28285645879. The next prime is 28285645897. The reversal of 28285645884 is 48854658282.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×28285645884² (a number of 22 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 1178568567 + ... + 1178568590.

It is an arithmetic number, because the mean of its divisors is an integer number (5499986702).

Almost surely, 2^28285645884 is an apocalyptic number.

It is an amenable number.

28285645884 is an abundant number, since it is smaller than the sum of its proper divisors (37714194540).

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

28285645884 is a wasteful number, since it uses less digits than its factorization.

28285645884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357137164 (or 2357137162 counting only the distinct ones).

The product of its digits is 39321600, while the sum is 60.

The spelling of 28285645884 in words is "twenty-eight billion, two hundred eighty-five million, six hundred forty-five thousand, eight hundred eighty-four".