25538978 has 8 divisors (see below), whose sum is σ = 39544320. Its totient is φ = 12357540.

The previous prime is 25538969. The next prime is 25539013. The reversal of 25538978 is 87983552.

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 205898 + ... + 206021.

It is an arithmetic number, because the mean of its divisors is an integer number (4943040).

Almost surely, 2^25538978 is an apocalyptic number.

25538978 is a deficient number, since it is larger than the sum of its proper divisors (14005342).

25538978 is a wasteful number, since it uses less digits than its factorization.

25538978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411952.

The product of its digits is 604800, while the sum is 47.

The square root of 25538978 is about 5053.6103925807. The cubic root of 25538978 is about 294.4881596526.

The spelling of 25538978 in words is "twenty-five million, five hundred thirty-eight thousand, nine hundred seventy-eight".