25427978 has 4 divisors (see below), whose sum is σ = 38141970. Its totient is φ = 12713988.

The previous prime is 25427957. The next prime is 25427981. The reversal of 25427978 is 87972452.

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., 22629049 + 2798929 = 4757^2 + 1673^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6356993 + ... + 6356996.

Almost surely, 2^25427978 is an apocalyptic number.

25427978 is a deficient number, since it is larger than the sum of its proper divisors (12713992).

25427978 is a wasteful number, since it uses less digits than its factorization.

25427978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12713991.

The product of its digits is 282240, while the sum is 44.

The square root of 25427978 is about 5042.6161860685. The cubic root of 25427978 is about 294.0608956495.

The spelling of 25427978 in words is "twenty-five million, four hundred twenty-seven thousand, nine hundred seventy-eight".