2491361280 has 192 divisors, whose sum is σ = 8856993600. Its totient is φ = 664289280.

The previous prime is 2491361267. The next prime is 2491361333. The reversal of 2491361280 is 821631942.

2491361280 is a `hidden beast` number, since 24 + 9 + 13 + 612 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271975 + ... + 280985.

It is an arithmetic number, because the mean of its divisors is an integer number (46130175).

Almost surely, 2^2491361280 is an apocalyptic number.

2491361280 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 2491361280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4428496800).

2491361280 is an abundant number, since it is smaller than the sum of its proper divisors (6365632320).

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

2491361280 is an equidigital number, since it uses as much as digits as its factorization.

2491361280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9047 (or 9021 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 2491361280 is about 49913.5380433004. The cubic root of 2491361280 is about 1355.6437312923.

The spelling of 2491361280 in words is "two billion, four hundred ninety-one million, three hundred sixty-one thousand, two hundred eighty".