2491137780 has 24 divisors (see below), whose sum is σ = 6975185952. Its totient is φ = 664303392.

The previous prime is 2491137767. The next prime is 2491137811. The reversal of 2491137780 is 877311942.

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, 20759422 + ... + 20759541.

It is an arithmetic number, because the mean of its divisors is an integer number (290632748).

Almost surely, 2^2491137780 is an apocalyptic number.

2491137780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2491137780 is an abundant number, since it is smaller than the sum of its proper divisors (4484048172).

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

2491137780 is a wasteful number, since it uses less digits than its factorization.

2491137780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41518975 (or 41518973 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 2491137780 is about 49911.2991215416. The cubic root of 2491137780 is about 1355.6031918174.

The spelling of 2491137780 in words is "two billion, four hundred ninety-one million, one hundred thirty-seven thousand, seven hundred eighty".