991734580 has 12 divisors (see below), whose sum is σ = 2082642660. Its totient is φ = 396693824.

The previous prime is 991734577. The next prime is 991734607. The reversal of 991734580 is 85437199.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 387459856 + 604274724 = 19684^2 + 24582^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 991734580.

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, 24793345 + ... + 24793384.

It is an arithmetic number, because the mean of its divisors is an integer number (173553555).

Almost surely, 2^991734580 is an apocalyptic number.

It is an amenable number.

991734580 is an abundant number, since it is smaller than the sum of its proper divisors (1090908080).

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

991734580 is a wasteful number, since it uses less digits than its factorization.

991734580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49586738 (or 49586736 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 991734580 is about 31491.8176674513. The cubic root of 991734580 is about 997.2372341542.

The spelling of 991734580 in words is "nine hundred ninety-one million, seven hundred thirty-four thousand, five hundred eighty".