25621881 has 8 divisors (see below), whose sum is σ = 34354080. Its totient is φ = 16985472.

The previous prime is 25621879. The next prime is 25621889. The reversal of 25621881 is 18812652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25621881 - 2¹ = 25621879 is a prime.

It is a super-2 number, since 2×25621881² = 1312961571956322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25621889) 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, 23320 + ... + 24393.

It is an arithmetic number, because the mean of its divisors is an integer number (4294260).

Almost surely, 2^25621881 is an apocalyptic number.

It is an amenable number.

25621881 is a deficient number, since it is larger than the sum of its proper divisors (8732199).

25621881 is a wasteful number, since it uses less digits than its factorization.

25621881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47895.

The product of its digits is 7680, while the sum is 33.

The square root of 25621881 is about 5061.8061005929. The cubic root of 25621881 is about 294.8064650345.

The spelling of 25621881 in words is "twenty-five million, six hundred twenty-one thousand, eight hundred eighty-one".