2491887680 has 28 divisors (see below), whose sum is σ = 5933808300. Its totient is φ = 996754944.

The previous prime is 2491887647. The next prime is 2491887683. The reversal of 2491887680 is 867881942.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 593019904 + 1898867776 = 24352^2 + 43576^2 .

It is not an unprimeable number, because it can be changed into a prime (2491887683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3893255 + ... + 3893894.

It is an arithmetic number, because the mean of its divisors is an integer number (211921725).

Almost surely, 2^2491887680 is an apocalyptic number.

2491887680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2491887680 is an abundant number, since it is smaller than the sum of its proper divisors (3441920620).

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

2491887680 is an equidigital number, since it uses as much as digits as its factorization.

2491887680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7787166 (or 7787156 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 53.

The square root of 2491887680 is about 49918.8108832733. The cubic root of 2491887680 is about 1355.7392026065.

The spelling of 2491887680 in words is "two billion, four hundred ninety-one million, eight hundred eighty-seven thousand, six hundred eighty".