28387173240 has 192 divisors, whose sum is σ = 98234791200. Its totient is φ = 7084548096.

The previous prime is 28387173233. The next prime is 28387173259. The reversal of 28387173240 is 4237178382.

28387173240 is a `hidden beast` number, since 28 + 387 + 1 + 7 + 3 + 240 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1082524 + ... + 1108436.

Almost surely, 2^28387173240 is an apocalyptic number.

28387173240 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 28387173240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49117395600).

28387173240 is an abundant number, since it is smaller than the sum of its proper divisors (69847617960).

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

28387173240 is a wasteful number, since it uses less digits than its factorization.

28387173240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26126 (or 26119 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The spelling of 28387173240 in words is "twenty-eight billion, three hundred eighty-seven million, one hundred seventy-three thousand, two hundred forty".