991332064 has 24 divisors (see below), whose sum is σ = 1952663328. Its totient is φ = 495417600.

The previous prime is 991332047. The next prime is 991332073. The reversal of 991332064 is 460233199.

It is a super-2 number, since 2×991332064² = 1965478522229000192, which contains 22 as substring.

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, 68644 + ... + 81820.

It is an arithmetic number, because the mean of its divisors is an integer number (81360972).

Almost surely, 2^991332064 is an apocalyptic number.

It is an amenable number.

991332064 is a deficient number, since it is larger than the sum of its proper divisors (961331264).

991332064 is a wasteful number, since it uses less digits than its factorization.

991332064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15538 (or 15530 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 991332064 is about 31485.4262159495. The cubic root of 991332064 is about 997.1022994418.

The spelling of 991332064 in words is "nine hundred ninety-one million, three hundred thirty-two thousand, sixty-four".