991272240 has 120 divisors (see below), whose sum is σ = 3804616608. Its totient is φ = 226575360.

The previous prime is 991272221. The next prime is 991272257. The reversal of 991272240 is 42272199.

991272240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 991272195 and 991272204.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93301 + ... + 103380.

Almost surely, 2^991272240 is an apocalyptic number.

991272240 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

991272240 is an abundant number, since it is smaller than the sum of its proper divisors (2813344368).

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

991272240 is a wasteful number, since it uses less digits than its factorization.

991272240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196707 (or 196698 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 991272240 is about 31484.4761747754. The cubic root of 991272240 is about 997.0822416327.

The spelling of 991272240 in words is "nine hundred ninety-one million, two hundred seventy-two thousand, two hundred forty".