28194923520 has 528 divisors, whose sum is σ = 104843082240. Its totient is φ = 6987644928.

The previous prime is 28194923513. The next prime is 28194923527. The reversal of 28194923520 is 2532949182.

28194923520 is a `hidden beast` number, since 2 + 81 + 9 + 49 + 2 + 3 + 520 = 666.

It is an interprime number because it is at equal distance from previous prime (28194923513) and next prime (28194923527).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28194923527) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 39213721 + ... + 39214439.

Almost surely, 2^28194923520 is an apocalyptic number.

28194923520 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 28194923520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52421541120).

28194923520 is an abundant number, since it is smaller than the sum of its proper divisors (76648158720).

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

28194923520 is a wasteful number, since it uses less digits than its factorization.

28194923520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810 (or 789 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 28194923520 in words is "twenty-eight billion, one hundred ninety-four million, nine hundred twenty-three thousand, five hundred twenty".