25781290 has 32 divisors (see below), whose sum is σ = 50544000. Its totient is φ = 9430848.

The previous prime is 25781281. The next prime is 25781297. The reversal of 25781290 is 9218752.

It is not an unprimeable number, because it can be changed into a prime (25781297) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3171 + ... + 7849.

It is an arithmetic number, because the mean of its divisors is an integer number (1579500).

Almost surely, 2^25781290 is an apocalyptic number.

25781290 is a deficient number, since it is larger than the sum of its proper divisors (24762710).

25781290 is a wasteful number, since it uses less digits than its factorization.

25781290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4734.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 25781290 is about 5077.5279418237. The cubic root of 25781290 is about 295.4165903978.

The spelling of 25781290 in words is "twenty-five million, seven hundred eighty-one thousand, two hundred ninety".