2580781 has 12 divisors (see below), whose sum is σ = 3100800. Its totient is φ = 2139480.

The previous prime is 2580757. The next prime is 2580791. The reversal of 2580781 is 1870852.

2580781 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 2580781 - 2⁵ = 2580749 is a prime.

It is a super-2 number, since 2×2580781² = 13320861139922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2580701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 670 + ... + 2368.

It is an arithmetic number, because the mean of its divisors is an integer number (258400).

2^2580781 is an apocalyptic number.

It is an amenable number.

2580781 is a deficient number, since it is larger than the sum of its proper divisors (520019).

2580781 is a wasteful number, since it uses less digits than its factorization.

2580781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1744 (or 1737 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 2580781 is about 1606.4809367061. The cubic root of 2580781 is about 137.1672349914.

The spelling of 2580781 in words is "two million, five hundred eighty thousand, seven hundred eighty-one".