8516321280 has 180 divisors, whose sum is σ = 29524901952. Its totient is φ = 2270822400.

The previous prime is 8516321263. The next prime is 8516321357. The reversal of 8516321280 is 821236158.

It is a happy number.

8516321280 is a `hidden beast` number, since 8 + 5 + 1 + 632 + 12 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (180).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 731505 + ... + 743055.

Almost surely, 2^8516321280 is an apocalyptic number.

8516321280 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 8516321280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14762450976).

8516321280 is an abundant number, since it is smaller than the sum of its proper divisors (21008580672).

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

8516321280 is a wasteful number, since it uses less digits than its factorization.

8516321280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11590 (or 11561 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 8516321280 is about 92283.9166919133. The cubic root of 8516321280 is about 2042.1329478695.

The spelling of 8516321280 in words is "eight billion, five hundred sixteen million, three hundred twenty-one thousand, two hundred eighty".