28161284688 has 80 divisors (see below), whose sum is σ = 80872680960. Its totient is φ = 9382523904.

The previous prime is 28161284687. The next prime is 28161284699. The reversal of 28161284688 is 88648216182.

28161284688 is a `hidden beast` number, since 281 + 6 + 1 + 284 + 6 + 88 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28161284687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 938656 + ... + 968192.

It is an arithmetic number, because the mean of its divisors is an integer number (1010908512).

Almost surely, 2^28161284688 is an apocalyptic number.

It is an amenable number.

28161284688 is an abundant number, since it is smaller than the sum of its proper divisors (52711396272).

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

28161284688 is a wasteful number, since it uses less digits than its factorization.

28161284688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31761 (or 31749 counting only the distinct ones).

The product of its digits is 2359296, while the sum is 54.

The spelling of 28161284688 in words is "twenty-eight billion, one hundred sixty-one million, two hundred eighty-four thousand, six hundred eighty-eight".