25561378 has 4 divisors (see below), whose sum is σ = 38342070. Its totient is φ = 12780688.

The previous prime is 25561369. The next prime is 25561411. The reversal of 25561378 is 87316552.

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., 12837889 + 12723489 = 3583^2 + 3567^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6390343 + ... + 6390346.

Almost surely, 2^25561378 is an apocalyptic number.

25561378 is a deficient number, since it is larger than the sum of its proper divisors (12780692).

25561378 is a wasteful number, since it uses less digits than its factorization.

25561378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12780691.

The product of its digits is 50400, while the sum is 37.

The square root of 25561378 is about 5055.8261441628. The cubic root of 25561378 is about 294.5742321014.

The spelling of 25561378 in words is "twenty-five million, five hundred sixty-one thousand, three hundred seventy-eight".