8513979840 has 168 divisors, whose sum is σ = 29765231808. Its totient is φ = 2233128960.

The previous prime is 8513979823. The next prime is 8513979871. The reversal of 8513979840 is 489793158.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 151449 + ... + 199911.

Almost surely, 2^8513979840 is an apocalyptic number.

8513979840 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 8513979840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14882615904).

8513979840 is an abundant number, since it is smaller than the sum of its proper divisors (21251251968).

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

8513979840 is a wasteful number, since it uses less digits than its factorization.

8513979840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48547 (or 48534 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The square root of 8513979840 is about 92271.2297522906. The cubic root of 8513979840 is about 2041.9457790249.

The spelling of 8513979840 in words is "eight billion, five hundred thirteen million, nine hundred seventy-nine thousand, eight hundred forty".