991327616 has 32 divisors (see below), whose sum is σ = 1989361080. Its totient is φ = 492037120.

The previous prime is 991327609. The next prime is 991327621. The reversal of 991327616 is 616723199.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10730 + ... + 45801.

Almost surely, 2^991327616 is an apocalyptic number.

It is an amenable number.

991327616 is an abundant number, since it is smaller than the sum of its proper divisors (998033464).

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

991327616 is a wasteful number, since it uses less digits than its factorization.

991327616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56682 (or 56670 counting only the distinct ones).

The product of its digits is 122472, while the sum is 44.

The square root of 991327616 is about 31485.3555800153. The cubic root of 991327616 is about 997.1008081428.

The spelling of 991327616 in words is "nine hundred ninety-one million, three hundred twenty-seven thousand, six hundred sixteen".