2578631265 has 192 divisors, whose sum is σ = 5607014400. Its totient is φ = 1070226432.

The previous prime is 2578631261. The next prime is 2578631291. The reversal of 2578631265 is 5621368752.

2578631265 is a `hidden beast` number, since 2 + 5 + 7 + 8 + 631 + 2 + 6 + 5 = 666.

It is not a de Polignac number, because 2578631265 - 2² = 2578631261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 2578631265.

It is not an unprimeable number, because it can be changed into a prime (2578631261) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 25035204 + ... + 25035306.

It is an arithmetic number, because the mean of its divisors is an integer number (29203200).

Almost surely, 2^2578631265 is an apocalyptic number.

It is an amenable number.

2578631265 is an abundant number, since it is smaller than the sum of its proper divisors (3028383135).

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

2578631265 is a wasteful number, since it uses less digits than its factorization.

2578631265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276 (or 273 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 2578631265 is about 50780.2251373505. The cubic root of 2578631265 is about 1371.2913862731.

The spelling of 2578631265 in words is "two billion, five hundred seventy-eight million, six hundred thirty-one thousand, two hundred sixty-five".