28137440430 has 144 divisors (see below), whose sum is σ = 81777412080. Its totient is φ = 6705431040.

The previous prime is 28137440411. The next prime is 28137440437. The reversal of 28137440430 is 3404473182.

28137440430 is a `hidden beast` number, since 281 + 374 + 4 + 0 + 4 + 3 + 0 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28137440437) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 620614 + ... + 664406.

It is an arithmetic number, because the mean of its divisors is an integer number (567898695).

Almost surely, 2^28137440430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28137440430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40888706040).

28137440430 is an abundant number, since it is smaller than the sum of its proper divisors (53639971650).

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

28137440430 is a wasteful number, since it uses less digits than its factorization.

28137440430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43887 (or 43873 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The spelling of 28137440430 in words is "twenty-eight billion, one hundred thirty-seven million, four hundred forty thousand, four hundred thirty".