991044620 has 24 divisors (see below), whose sum is σ = 2131956288. Its totient is φ = 386748800.

The previous prime is 991044619. The next prime is 991044629. The reversal of 991044620 is 26440199.

It is not an unprimeable number, because it can be changed into a prime (991044629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 603476 + ... + 605115.

It is an arithmetic number, because the mean of its divisors is an integer number (88831512).

Almost surely, 2^991044620 is an apocalyptic number.

It is an amenable number.

991044620 is an abundant number, since it is smaller than the sum of its proper divisors (1140911668).

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

991044620 is a wasteful number, since it uses less digits than its factorization.

991044620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208641 (or 1208639 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 991044620 is about 31480.8611699235. The cubic root of 991044620 is about 997.0059177517.

The spelling of 991044620 in words is "nine hundred ninety-one million, forty-four thousand, six hundred twenty".