8387491680 has 240 divisors, whose sum is σ = 30161832624. Its totient is φ = 2194283520.

The previous prime is 8387491661. The next prime is 8387491691. The reversal of 8387491680 is 861947838.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 680775 + ... + 692985.

Almost surely, 2^8387491680 is an apocalyptic number.

8387491680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

8387491680 is the 45792-nd decagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8387491680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15080916312).

8387491680 is an abundant number, since it is smaller than the sum of its proper divisors (21774340944).

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

8387491680 is a wasteful number, since it uses less digits than its factorization.

8387491680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12291 (or 12274 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The square root of 8387491680 is about 91583.2499969290. The cubic root of 8387491680 is about 2031.7832115221.

The spelling of 8387491680 in words is "eight billion, three hundred eighty-seven million, four hundred ninety-one thousand, six hundred eighty".