8517487720 has 96 divisors (see below), whose sum is σ = 22318475400. Its totient is φ = 2916974592.

The previous prime is 8517487651. The next prime is 8517487753. The reversal of 8517487720 is 277847158.

It can be written as a sum of positive squares in 4 ways, for example, as 8375544324 + 141943396 = 91518^2 + 11914^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2257996 + ... + 2261764.

Almost surely, 2^8517487720 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 8517487720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11159237700).

8517487720 is an abundant number, since it is smaller than the sum of its proper divisors (13800987680).

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

8517487720 is a wasteful number, since it uses less digits than its factorization.

8517487720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4947 (or 4936 counting only the distinct ones).

The product of its (nonzero) digits is 878080, while the sum is 49.

The square root of 8517487720 is about 92290.2363199922. The cubic root of 8517487720 is about 2042.2261773572.

The spelling of 8517487720 in words is "eight billion, five hundred seventeen million, four hundred eighty-seven thousand, seven hundred twenty".