25878561 has 8 divisors (see below), whose sum is σ = 35307360. Its totient is φ = 16851072.

The previous prime is 25878553. The next prime is 25878581. The reversal of 25878561 is 16587852.

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

It is not a de Polignac number, because 25878561 - 2³ = 25878553 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (25878581) 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, 100176 + ... + 100433.

It is an arithmetic number, because the mean of its divisors is an integer number (4413420).

Almost surely, 2^25878561 is an apocalyptic number.

It is an amenable number.

25878561 is a deficient number, since it is larger than the sum of its proper divisors (9428799).

25878561 is a wasteful number, since it uses less digits than its factorization.

25878561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200655.

The product of its digits is 134400, while the sum is 42.

The square root of 25878561 is about 5087.0975025057. The cubic root of 25878561 is about 295.7876528202.

The spelling of 25878561 in words is "twenty-five million, eight hundred seventy-eight thousand, five hundred sixty-one".