991610080 has 24 divisors (see below), whose sum is σ = 2342679192. Its totient is φ = 396643968.

The previous prime is 991610077. The next prime is 991610099. The reversal of 991610080 is 80016199.

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, 3098622 + ... + 3098941.

It is an arithmetic number, because the mean of its divisors is an integer number (97611633).

Almost surely, 2^991610080 is an apocalyptic number.

It is an amenable number.

991610080 is an abundant number, since it is smaller than the sum of its proper divisors (1351069112).

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

991610080 is a wasteful number, since it uses less digits than its factorization.

991610080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6197578 (or 6197570 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 991610080 is about 31489.8409014717. The cubic root of 991610080 is about 997.1955021444.

The spelling of 991610080 in words is "nine hundred ninety-one million, six hundred ten thousand, eighty".