2591047578 has 48 divisors (see below), whose sum is σ = 6038625600. Its totient is φ = 739013184.

The previous prime is 2591047567. The next prime is 2591047621. The reversal of 2591047578 is 8757401952.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 168750 + ... + 183462.

It is an arithmetic number, because the mean of its divisors is an integer number (125804700).

Almost surely, 2^2591047578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2591047578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3019312800).

2591047578 is an abundant number, since it is smaller than the sum of its proper divisors (3447578022).

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

2591047578 is a wasteful number, since it uses less digits than its factorization.

2591047578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15331 (or 15324 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 48.

The square root of 2591047578 is about 50902.3337186027. Note that the first 3 decimals coincide. The cubic root of 2591047578 is about 1373.4888218368.

The spelling of 2591047578 in words is "two billion, five hundred ninety-one million, forty-seven thousand, five hundred seventy-eight".