991329360 has 80 divisors (see below), whose sum is σ = 3512144256. Its totient is φ = 226589184.

The previous prime is 991329349. The next prime is 991329421. The reversal of 991329360 is 63923199.

It is a happy number.

991329360 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 293359 + ... + 296718.

Almost surely, 2^991329360 is an apocalyptic number.

It is an amenable number.

991329360 is an abundant number, since it is smaller than the sum of its proper divisors (2520814896).

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

991329360 is a wasteful number, since it uses less digits than its factorization.

991329360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590100 (or 590094 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 42.

The square root of 991329360 is about 31485.3832754185. The cubic root of 991329360 is about 997.1013928613.

The spelling of 991329360 in words is "nine hundred ninety-one million, three hundred twenty-nine thousand, three hundred sixty".