28187274240 has 220 divisors, whose sum is σ = 101008740096. Its totient is φ = 7516495872.

The previous prime is 28187274221. The next prime is 28187274281. The reversal of 28187274240 is 4247278182.

28187274240 is a `hidden beast` number, since 28 + 187 + 27 + 424 + 0 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 380737 + ... + 448703.

Almost surely, 2^28187274240 is an apocalyptic number.

28187274240 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 28187274240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50504370048).

28187274240 is an abundant number, since it is smaller than the sum of its proper divisors (72821465856).

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

28187274240 is an equidigital number, since it uses as much as digits as its factorization.

28187274240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68004 (or 67977 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 45.

The spelling of 28187274240 in words is "twenty-eight billion, one hundred eighty-seven million, two hundred seventy-four thousand, two hundred forty".