25820881 has 4 divisors (see below), whose sum is σ = 26943552. Its totient is φ = 24698212.

The previous prime is 25820777. The next prime is 25820887. The reversal of 25820881 is 18802852.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25820881 - 2¹⁷ = 25689809 is a prime.

It is a super-2 number, since 2×25820881² = 1333435791232322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25820887) 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, 561301 + ... + 561346.

It is an arithmetic number, because the mean of its divisors is an integer number (6735888).

Almost surely, 2^25820881 is an apocalyptic number.

It is an amenable number.

25820881 is a deficient number, since it is larger than the sum of its proper divisors (1122671).

25820881 is a wasteful number, since it uses less digits than its factorization.

25820881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122670.

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 25820881 is about 5081.4250953842. The cubic root of 25820881 is about 295.5677317415.

The spelling of 25820881 in words is "twenty-five million, eight hundred twenty thousand, eight hundred eighty-one".