2578765064 has 8 divisors (see below), whose sum is σ = 4835184510. Its totient is φ = 1289382528.

The previous prime is 2578765009. The next prime is 2578765067. The reversal of 2578765064 is 4605678752.

It can be written as a sum of positive squares in only one way, i.e., 1379528164 + 1199236900 = 37142^2 + 34630^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (2578765067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161172809 + ... + 161172824.

Almost surely, 2^2578765064 is an apocalyptic number.

It is an amenable number.

2578765064 is a deficient number, since it is larger than the sum of its proper divisors (2256419446).

2578765064 is a wasteful number, since it uses less digits than its factorization.

2578765064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322345639 (or 322345635 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 50.

The square root of 2578765064 is about 50781.5425523881. The cubic root of 2578765064 is about 1371.3151035380.

The spelling of 2578765064 in words is "two billion, five hundred seventy-eight million, seven hundred sixty-five thousand, sixty-four".