991286072 has 24 divisors (see below), whose sum is σ = 2162117160. Its totient is φ = 424836720.

The previous prime is 991286057. The next prime is 991286117. The reversal of 991286072 is 270682199.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1264004 + ... + 1264787.

It is an arithmetic number, because the mean of its divisors is an integer number (90088215).

Almost surely, 2^991286072 is an apocalyptic number.

It is an amenable number.

991286072 is an abundant number, since it is smaller than the sum of its proper divisors (1170831088).

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

991286072 is a wasteful number, since it uses less digits than its factorization.

991286072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2528811 (or 2528800 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 991286072 is about 31484.6958378194. The cubic root of 991286072 is about 997.0868793016.

The spelling of 991286072 in words is "nine hundred ninety-one million, two hundred eighty-six thousand, seventy-two".