8197521408 has 360 divisors, whose sum is σ = 25762726080. Its totient is φ = 2601123840.

The previous prime is 8197521391. The next prime is 8197521439. The reversal of 8197521408 is 8041257918.

8197521408 is a `hidden beast` number, since 8 + 197 + 52 + 1 + 408 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115458013 + ... + 115458083.

It is an arithmetic number, because the mean of its divisors is an integer number (71563128).

Almost surely, 2^8197521408 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 8197521408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12881363040).

8197521408 is an abundant number, since it is smaller than the sum of its proper divisors (17565204672).

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

8197521408 is an frugal number, since it uses more digits than its factorization.

8197521408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The square root of 8197521408 is about 90540.1646121764. The cubic root of 8197521408 is about 2016.3264777385.

The spelling of 8197521408 in words is "eight billion, one hundred ninety-seven million, five hundred twenty-one thousand, four hundred eight".