25784897 has 4 divisors (see below), whose sum is σ = 25958100. Its totient is φ = 25611696.

The previous prime is 25784887. The next prime is 25784923. The reversal of 25784897 is 79848752.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10699441 + 15085456 = 3271^2 + 3884^2 .

It is a cyclic number.

It is not a de Polignac number, because 25784897 - 2⁸ = 25784641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25784887) 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, 86378 + ... + 86675.

It is an arithmetic number, because the mean of its divisors is an integer number (6489525).

Almost surely, 2^25784897 is an apocalyptic number.

It is an amenable number.

25784897 is a deficient number, since it is larger than the sum of its proper divisors (173203).

25784897 is a wasteful number, since it uses less digits than its factorization.

25784897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173202.

The product of its digits is 1128960, while the sum is 50.

The square root of 25784897 is about 5077.8831219318. The cubic root of 25784897 is about 295.4303667702.

The spelling of 25784897 in words is "twenty-five million, seven hundred eighty-four thousand, eight hundred ninety-seven".