1991460288 has 56 divisors (see below), whose sum is σ = 5275996560. Its totient is φ = 662947840.

The previous prime is 1991460277. The next prime is 1991460293. The reversal of 1991460288 is 8820641991.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148918 + ... + 161738.

Almost surely, 2^1991460288 is an apocalyptic number.

It is an amenable number.

1991460288 is an abundant number, since it is smaller than the sum of its proper divisors (3284536272).

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

1991460288 is a wasteful number, since it uses less digits than its factorization.

1991460288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13645 (or 13635 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 48.

The square root of 1991460288 is about 44625.7805309890. The cubic root of 1991460288 is about 1258.1252643979.

The spelling of 1991460288 in words is "one billion, nine hundred ninety-one million, four hundred sixty thousand, two hundred eighty-eight".