8542947840 has 160 divisors (see below), whose sum is σ = 31212466560. Its totient is φ = 1952661504.

The previous prime is 8542947817. The next prime is 8542947841. The reversal of 8542947840 is 487492458.

It is a tau number, because it is divible by the number of its divisors (160).

It is not an unprimeable number, because it can be changed into a prime (8542947841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25695 + ... + 133214.

It is an arithmetic number, because the mean of its divisors is an integer number (195077916).

Almost surely, 2^8542947840 is an apocalyptic number.

8542947840 is a gapful number since it is divisible by the number (80) 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 8542947840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15606233280).

8542947840 is an abundant number, since it is smaller than the sum of its proper divisors (22669518720).

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

8542947840 is a wasteful number, since it uses less digits than its factorization.

8542947840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158942 (or 158926 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 51.

The square root of 8542947840 is about 92428.0684640764. The cubic root of 8542947840 is about 2044.2589990723.

The spelling of 8542947840 in words is "eight billion, five hundred forty-two million, nine hundred forty-seven thousand, eight hundred forty".