25727978 has 4 divisors (see below), whose sum is σ = 38591970. Its totient is φ = 12863988.

The previous prime is 25727963. The next prime is 25727983. The reversal of 25727978 is 87972752.

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., 20313049 + 5414929 = 4507^2 + 2327^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6431993 + ... + 6431996.

Almost surely, 2^25727978 is an apocalyptic number.

25727978 is a deficient number, since it is larger than the sum of its proper divisors (12863992).

25727978 is a wasteful number, since it uses less digits than its factorization.

25727978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12863991.

The product of its digits is 493920, while the sum is 47.

The square root of 25727978 is about 5072.2754262757. The cubic root of 25727978 is about 295.2128235384.

The spelling of 25727978 in words is "twenty-five million, seven hundred twenty-seven thousand, nine hundred seventy-eight".