2491604256 has 48 divisors (see below), whose sum is σ = 6544546848. Its totient is φ = 830016000.

The previous prime is 2491604251. The next prime is 2491604293. The reversal of 2491604256 is 6524061942.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (2491604251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165691 + ... + 180101.

It is an arithmetic number, because the mean of its divisors is an integer number (136344726).

Almost surely, 2^2491604256 is an apocalyptic number.

It is an amenable number.

2491604256 is an abundant number, since it is smaller than the sum of its proper divisors (4052942592).

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

2491604256 is a wasteful number, since it uses less digits than its factorization.

2491604256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16225 (or 16217 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 2491604256 is about 49915.9719528730. The cubic root of 2491604256 is about 1355.6878006647.

The spelling of 2491604256 in words is "two billion, four hundred ninety-one million, six hundred four thousand, two hundred fifty-six".