25997770 has 8 divisors (see below), whose sum is σ = 46796004. Its totient is φ = 10399104.

The previous prime is 25997767. The next prime is 25997771. The reversal of 25997770 is 7779952.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25775929 + 221841 = 5077^2 + 471^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 25997770.

It is not an unprimeable number, because it can be changed into a prime (25997771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1299879 + ... + 1299898.

Almost surely, 2^25997770 is an apocalyptic number.

25997770 is a deficient number, since it is larger than the sum of its proper divisors (20798234).

25997770 is a wasteful number, since it uses less digits than its factorization.

25997770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2599784.

The product of its (nonzero) digits is 277830, while the sum is 46.

The square root of 25997770 is about 5098.8008394131. The cubic root of 25997770 is about 296.2411368983.

The spelling of 25997770 in words is "twenty-five million, nine hundred ninety-seven thousand, seven hundred seventy".