8601991380 has 36 divisors (see below), whose sum is σ = 26092707732. Its totient is φ = 2293864320.

The previous prime is 8601991379. The next prime is 8601991403. The reversal of 8601991380 is 831991068.

8601991380 is a `hidden beast` number, since 8 + 601 + 9 + 9 + 1 + 38 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2892073284 + 5709918096 = 53778^2 + 75564^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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, 23894241 + ... + 23894600.

It is an arithmetic number, because the mean of its divisors is an integer number (724797437).

Almost surely, 2^8601991380 is an apocalyptic number.

It is an amenable number.

8601991380 is an abundant number, since it is smaller than the sum of its proper divisors (17490716352).

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

8601991380 is a wasteful number, since it uses less digits than its factorization.

8601991380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47788856 (or 47788851 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 8601991380 is about 92746.9211348819. The cubic root of 8601991380 is about 2048.9577394681.

The spelling of 8601991380 in words is "eight billion, six hundred one million, nine hundred ninety-one thousand, three hundred eighty".