25718645 has 4 divisors (see below), whose sum is σ = 30862380. Its totient is φ = 20574912.

The previous prime is 25718633. The next prime is 25718653. The reversal of 25718645 is 54681752.

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 10407076 + 15311569 = 3226^2 + 3913^2 .

It is a cyclic number.

It is not a de Polignac number, because 25718645 - 2¹⁶ = 25653109 is a prime.

It is a super-2 number, since 2×25718645² = 1322897401272050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25718599 and 25718608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2571860 + ... + 2571869.

It is an arithmetic number, because the mean of its divisors is an integer number (7715595).

Almost surely, 2^25718645 is an apocalyptic number.

It is an amenable number.

25718645 is a deficient number, since it is larger than the sum of its proper divisors (5143735).

25718645 is an equidigital number, since it uses as much as digits as its factorization.

25718645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5143734.

The product of its digits is 67200, while the sum is 38.

The square root of 25718645 is about 5071.3553415236. The cubic root of 25718645 is about 295.1771223975.

The spelling of 25718645 in words is "twenty-five million, seven hundred eighteen thousand, six hundred forty-five".