28171833620 has 36 divisors (see below), whose sum is σ = 68819767380. Its totient is φ = 9658914048.

The previous prime is 28171833607. The next prime is 28171833623. The reversal of 28171833620 is 2633817182.

It can be written as a sum of positive squares in 2 ways, for example, as 5618401936 + 22553431684 = 74956^2 + 150178^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28171833623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14372405 + ... + 14374364.

It is an arithmetic number, because the mean of its divisors is an integer number (1911660205).

Almost surely, 2^28171833620 is an apocalyptic number.

28171833620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28171833620 is an abundant number, since it is smaller than the sum of its proper divisors (40647933760).

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

28171833620 is a wasteful number, since it uses less digits than its factorization.

28171833620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28746792 (or 28746783 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The spelling of 28171833620 in words is "twenty-eight billion, one hundred seventy-one million, eight hundred thirty-three thousand, six hundred twenty".