291987020 has 48 divisors (see below), whose sum is σ = 666462720. Its totient is φ = 106811136.

The previous prime is 291987013. The next prime is 291987023. The reversal of 291987020 is 20789192.

It is not an unprimeable number, because it can be changed into a prime (291987023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23189 + ... + 33491.

It is an arithmetic number, because the mean of its divisors is an integer number (13884640).

Almost surely, 2^291987020 is an apocalyptic number.

291987020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 291987020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (333231360).

291987020 is an abundant number, since it is smaller than the sum of its proper divisors (374475700).

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

291987020 is a wasteful number, since it uses less digits than its factorization.

291987020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10434 (or 10432 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 291987020 is about 17087.6276878916. The cubic root of 291987020 is about 663.4189132841.

The spelling of 291987020 in words is "two hundred ninety-one million, nine hundred eighty-seven thousand, twenty".