2578256805 has 64 divisors (see below), whose sum is σ = 4495212288. Its totient is φ = 1257000960.

The previous prime is 2578256743. The next prime is 2578256819. The reversal of 2578256805 is 5086528752.

2578256805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2578256805 - 2⁶ = 2578256741 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1290067 + ... + 1292063.

It is an arithmetic number, because the mean of its divisors is an integer number (70237692).

Almost surely, 2^2578256805 is an apocalyptic number.

It is an amenable number.

2578256805 is a deficient number, since it is larger than the sum of its proper divisors (1916955483).

2578256805 is a wasteful number, since it uses less digits than its factorization.

2578256805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2166.

The product of its (nonzero) digits is 1344000, while the sum is 48.

The square root of 2578256805 is about 50776.5379383037. The cubic root of 2578256805 is about 1371.2250049803.

The spelling of 2578256805 in words is "two billion, five hundred seventy-eight million, two hundred fifty-six thousand, eight hundred five".