9991502440 has 32 divisors (see below), whose sum is σ = 22687137000. Its totient is φ = 3959933184.

The previous prime is 9991502413. The next prime is 9991502447. The reversal of 9991502440 is 442051999.

It can be written as a sum of positive squares in 4 ways, for example, as 7961279076 + 2030223364 = 89226^2 + 45058^2 .

It is not an unprimeable number, because it can be changed into a prime (9991502447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1141455 + ... + 1150174.

Almost surely, 2^9991502440 is an apocalyptic number.

It is an amenable number.

9991502440 is an abundant number, since it is smaller than the sum of its proper divisors (12695634560).

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

9991502440 is a wasteful number, since it uses less digits than its factorization.

9991502440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2291749 (or 2291745 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 9991502440 is about 99957.5031700972. The cubic root of 9991502440 is about 2153.8242691615.

The spelling of 9991502440 in words is "nine billion, nine hundred ninety-one million, five hundred two thousand, four hundred forty".