28239122784 has 24 divisors (see below), whose sum is σ = 74127697560. Its totient is φ = 9413040896.

The previous prime is 28239122771. The next prime is 28239122801. The reversal of 28239122784 is 48722193282.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147078669 + ... + 147078860.

It is an arithmetic number, because the mean of its divisors is an integer number (3088654065).

Almost surely, 2^28239122784 is an apocalyptic number.

28239122784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28239122784 is an abundant number, since it is smaller than the sum of its proper divisors (45888574776).

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

28239122784 is a wasteful number, since it uses less digits than its factorization.

28239122784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294157542 (or 294157534 counting only the distinct ones).

The product of its digits is 774144, while the sum is 48.

The spelling of 28239122784 in words is "twenty-eight billion, two hundred thirty-nine million, one hundred twenty-two thousand, seven hundred eighty-four".