2491856136 has 448 divisors, whose sum is σ = 9065779200. Its totient is φ = 622857600.

The previous prime is 2491856123. The next prime is 2491856177. The reversal of 2491856136 is 6316581942.

2491856136 is a `hidden beast` number, since 2 + 49 + 18 + 561 + 36 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 2491856091 and 2491856100.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 13920895 + ... + 13921073.

Almost surely, 2^2491856136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2491856136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4532889600).

2491856136 is an abundant number, since it is smaller than the sum of its proper divisors (6573923064).

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

2491856136 is a wasteful number, since it uses less digits than its factorization.

2491856136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252 (or 233 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 2491856136 is about 49918.4949292344. The cubic root of 2491856136 is about 1355.7334819610.

The spelling of 2491856136 in words is "two billion, four hundred ninety-one million, eight hundred fifty-six thousand, one hundred thirty-six".