5421543840 has 336 divisors, whose sum is σ = 19588457448. Its totient is φ = 1416849408.

The previous prime is 5421543839. The next prime is 5421543851. The reversal of 5421543840 is 483451245.

It is a happy number.

5421543840 is a `hidden beast` number, since 5 + 4 + 215 + 438 + 4 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5282963856 + 138579984 = 72684^2 + 11772^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 5421543795 and 5421543804.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 6181482 + ... + 6182358.

Almost surely, 2^5421543840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5421543840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9794228724).

5421543840 is an abundant number, since it is smaller than the sum of its proper divisors (14166913608).

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

5421543840 is an equidigital number, since it uses as much as digits as its factorization.

5421543840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963 (or 940 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The square root of 5421543840 is about 73631.1336324520. The cubic root of 5421543840 is about 1756.7406792655.

The spelling of 5421543840 in words is "five billion, four hundred twenty-one million, five hundred forty-three thousand, eight hundred forty".