8399061720 has 768 divisors, whose sum is σ = 34909056000. Its totient is φ = 1773674496.

The previous prime is 8399061709. The next prime is 8399061721. The reversal of 8399061720 is 271609938.

8399061720 is a `hidden beast` number, since 8 + 3 + 9 + 9 + 0 + 617 + 20 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8399061721) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 94371436 + ... + 94371524.

It is an arithmetic number, because the mean of its divisors is an integer number (45454500).

Almost surely, 2^8399061720 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 8399061720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17454528000).

8399061720 is an abundant number, since it is smaller than the sum of its proper divisors (26509994280).

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

8399061720 is a wasteful number, since it uses less digits than its factorization.

8399061720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 8399061720 is about 91646.3950191168. The cubic root of 8399061720 is about 2032.7170231627.

The spelling of 8399061720 in words is "eight billion, three hundred ninety-nine million, sixty-one thousand, seven hundred twenty".