8421917680 has 40 divisors (see below), whose sum is σ = 21361047984. Its totient is φ = 3062515200.

The previous prime is 8421917641. The next prime is 8421917701. The reversal of 8421917680 is 867191248.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 8421917680.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4784301 + ... + 4786060.

Almost surely, 2^8421917680 is an apocalyptic number.

8421917680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8421917680 is an abundant number, since it is smaller than the sum of its proper divisors (12939130304).

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

8421917680 is a wasteful number, since it uses less digits than its factorization.

8421917680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9570385 (or 9570379 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 8421917680 is about 91771.0067504983. The cubic root of 8421917680 is about 2034.5591979704.

The spelling of 8421917680 in words is "eight billion, four hundred twenty-one million, nine hundred seventeen thousand, six hundred eighty".