28169671720 has 64 divisors (see below), whose sum is σ = 65181697920. Its totient is φ = 10951858944.

The previous prime is 28169671711. The next prime is 28169671729. The reversal of 28169671720 is 2717696182.

It is an interprime number because it is at equal distance from previous prime (28169671711) and next prime (28169671729).

It is not an unprimeable number, because it can be changed into a prime (28169671729) 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, 164749 + ... + 288931.

It is an arithmetic number, because the mean of its divisors is an integer number (1018464030).

Almost surely, 2^28169671720 is an apocalyptic number.

28169671720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28169671720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32590848960).

28169671720 is an abundant number, since it is smaller than the sum of its proper divisors (37012026200).

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

28169671720 is a wasteful number, since it uses less digits than its factorization.

28169671720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124354 (or 124350 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 49.

The spelling of 28169671720 in words is "twenty-eight billion, one hundred sixty-nine million, six hundred seventy-one thousand, seven hundred twenty".