2578649864 has 16 divisors (see below), whose sum is σ = 5525678400. Its totient is φ = 1105135632.

The previous prime is 2578649833. The next prime is 2578649867. The reversal of 2578649864 is 4689468752.

It is a happy number.

It is a super-2 number, since 2×2578649864² = 13298870242214436992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2578649867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23023604 + ... + 23023715.

It is an arithmetic number, because the mean of its divisors is an integer number (345354900).

Almost surely, 2^2578649864 is an apocalyptic number.

It is an amenable number.

2578649864 is an abundant number, since it is smaller than the sum of its proper divisors (2947028536).

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

2578649864 is a wasteful number, since it uses less digits than its factorization.

2578649864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46047332 (or 46047328 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 59.

The square root of 2578649864 is about 50780.4082693316. The cubic root of 2578649864 is about 1371.2946831884.

The spelling of 2578649864 in words is "two billion, five hundred seventy-eight million, six hundred forty-nine thousand, eight hundred sixty-four".