8421287472 has 120 divisors (see below), whose sum is σ = 26321013264. Its totient is φ = 2591149824.

The previous prime is 8421287461. The next prime is 8421287477. The reversal of 8421287472 is 2747821248.

8421287472 is a `hidden beast` number, since 84 + 21 + 2 + 87 + 472 = 666.

It is not an unprimeable number, because it can be changed into a prime (8421287477) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32763 + ... + 133850.

Almost surely, 2^8421287472 is an apocalyptic number.

It is an amenable number.

8421287472 is an abundant number, since it is smaller than the sum of its proper divisors (17899725792).

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

8421287472 is a wasteful number, since it uses less digits than its factorization.

8421287472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166649 (or 166631 counting only the distinct ones).

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

The square root of 8421287472 is about 91767.5730963830. The cubic root of 8421287472 is about 2034.5084483464.

The spelling of 8421287472 in words is "eight billion, four hundred twenty-one million, two hundred eighty-seven thousand, four hundred seventy-two".