28184657520 has 80 divisors (see below), whose sum is σ = 87410789280. Its totient is φ = 7512609792.

The previous prime is 28184657483. The next prime is 28184657533. The reversal of 28184657520 is 2575648182.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is a self number, because there is not a number n which added to its sum of digits gives 28184657520.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 548782 + ... + 597938.

It is an arithmetic number, because the mean of its divisors is an integer number (1092634866).

Almost surely, 2^28184657520 is an apocalyptic number.

28184657520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28184657520 is an abundant number, since it is smaller than the sum of its proper divisors (59226131760).

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

28184657520 is a wasteful number, since it uses less digits than its factorization.

28184657520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51562 (or 51556 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 48.

The spelling of 28184657520 in words is "twenty-eight billion, one hundred eighty-four million, six hundred fifty-seven thousand, five hundred twenty".