8691961280 has 224 divisors, whose sum is σ = 23090282496. Its totient is φ = 3099672576.

The previous prime is 8691961259. The next prime is 8691961357. The reversal of 8691961280 is 821691968.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15889967 + ... + 15890513.

Almost surely, 2^8691961280 is an apocalyptic number.

8691961280 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 8691961280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11545141248).

8691961280 is an abundant number, since it is smaller than the sum of its proper divisors (14398321216).

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

8691961280 is a wasteful number, since it uses less digits than its factorization.

8691961280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731 (or 721 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 50.

The square root of 8691961280 is about 93230.6885097391. The cubic root of 8691961280 is about 2056.0764605902.

The spelling of 8691961280 in words is "eight billion, six hundred ninety-one million, nine hundred sixty-one thousand, two hundred eighty".