25878821 has 8 divisors (see below), whose sum is σ = 26182464. Its totient is φ = 25577280.

The previous prime is 25878803. The next prime is 25878857. The reversal of 25878821 is 12887852.

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

It is a cyclic number.

It is not a de Polignac number, because 25878821 - 2¹⁴ = 25862437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25878871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39926 + ... + 40568.

It is an arithmetic number, because the mean of its divisors is an integer number (3272808).

Almost surely, 2^25878821 is an apocalyptic number.

It is an amenable number.

25878821 is a deficient number, since it is larger than the sum of its proper divisors (303643).

25878821 is a wasteful number, since it uses less digits than its factorization.

25878821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051.

The product of its digits is 71680, while the sum is 41.

The square root of 25878821 is about 5087.1230572889. The cubic root of 25878821 is about 295.7886434025.

The spelling of 25878821 in words is "twenty-five million, eight hundred seventy-eight thousand, eight hundred twenty-one".