25990645 has 8 divisors (see below), whose sum is σ = 31319640. Its totient is φ = 20705280.

The previous prime is 25990631. The next prime is 25990661. The reversal of 25990645 is 54609952.

It can be written as a sum of positive squares in 4 ways, for example, as 528529 + 25462116 = 727^2 + 5046^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-25990645 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25990598 and 25990607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9580 + ... + 11989.

It is an arithmetic number, because the mean of its divisors is an integer number (3914955).

Almost surely, 2^25990645 is an apocalyptic number.

It is an amenable number.

25990645 is a deficient number, since it is larger than the sum of its proper divisors (5328995).

25990645 is a wasteful number, since it uses less digits than its factorization.

25990645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21815.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 25990645 is about 5098.1020978399. The cubic root of 25990645 is about 296.2140716160.

The spelling of 25990645 in words is "twenty-five million, nine hundred ninety thousand, six hundred forty-five".