2581906004 has 12 divisors (see below), whose sum is σ = 4520358528. Its totient is φ = 1290375000.

The previous prime is 2581906001. The next prime is 2581906057. The reversal of 2581906004 is 4006091852.

It is a super-2 number, since 2×2581906004² = 13332477226982496032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2581906001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134372 + ... + 152379.

It is an arithmetic number, because the mean of its divisors is an integer number (376696544).

Almost surely, 2^2581906004 is an apocalyptic number.

It is an amenable number.

2581906004 is a deficient number, since it is larger than the sum of its proper divisors (1938452524).

2581906004 is a wasteful number, since it uses less digits than its factorization.

2581906004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289006 (or 289004 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 2581906004 is about 50812.4591414350. The cubic root of 2581906004 is about 1371.8716323162.

Adding to 2581906004 its reverse (4006091852), we get a palindrome (6587997856).

The spelling of 2581906004 in words is "two billion, five hundred eighty-one million, nine hundred six thousand, four".