991967460 has 192 divisors, whose sum is σ = 3197988864. Its totient is φ = 227392000.

The previous prime is 991967441. The next prime is 991967491. The reversal of 991967460 is 64769199.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1532857 + ... + 1533503.

It is an arithmetic number, because the mean of its divisors is an integer number (16656192).

Almost surely, 2^991967460 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991967460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1598994432).

991967460 is an abundant number, since it is smaller than the sum of its proper divisors (2206021404).

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

991967460 is a wasteful number, since it uses less digits than its factorization.

991967460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794 (or 792 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 51.

The square root of 991967460 is about 31495.5149187944. The cubic root of 991967460 is about 997.3152854245.

The spelling of 991967460 in words is "nine hundred ninety-one million, nine hundred sixty-seven thousand, four hundred sixty".