2581261936 has 40 divisors (see below), whose sum is σ = 5495724144. Its totient is φ = 1164725760.

The previous prime is 2581261933. The next prime is 2581261951. The reversal of 2581261936 is 6391621852.

It is a junction number, because it is equal to n+sod(n) for n = 2581261892 and 2581261901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2581261931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29415 + ... + 77638.

Almost surely, 2^2581261936 is an apocalyptic number.

It is an amenable number.

2581261936 is an abundant number, since it is smaller than the sum of its proper divisors (2914462208).

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

2581261936 is a wasteful number, since it uses less digits than its factorization.

2581261936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107209 (or 107203 counting only the distinct ones).

The product of its digits is 155520, while the sum is 43.

The square root of 2581261936 is about 50806.1210485508. The cubic root of 2581261936 is about 1371.7575496581.

It can be divided in two parts, 258126 and 1936, that added together give a palindrome (260062).

The spelling of 2581261936 in words is "two billion, five hundred eighty-one million, two hundred sixty-one thousand, nine hundred thirty-six".