25550978 has 4 divisors (see below), whose sum is σ = 38326470. Its totient is φ = 12775488.

The previous prime is 25550977. The next prime is 25550981. The reversal of 25550978 is 87905552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 25170289 + 380689 = 5017^2 + 617^2 .

It is not an unprimeable number, because it can be changed into a prime (25550977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6387743 + ... + 6387746.

Almost surely, 2^25550978 is an apocalyptic number.

25550978 is a deficient number, since it is larger than the sum of its proper divisors (12775492).

25550978 is a wasteful number, since it uses less digits than its factorization.

25550978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12775491.

The product of its (nonzero) digits is 126000, while the sum is 41.

The square root of 25550978 is about 5054.7975231457. The cubic root of 25550978 is about 294.5342761492.

The spelling of 25550978 in words is "twenty-five million, five hundred fifty thousand, nine hundred seventy-eight".