25778621 has 8 divisors (see below), whose sum is σ = 28292544. Its totient is φ = 23293120.

The previous prime is 25778591. The next prime is 25778633. The reversal of 25778621 is 12687752.

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

It is a cyclic number.

It is not a de Polignac number, because 25778621 - 2²² = 21584317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25778671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5180 + ... + 8853.

It is an arithmetic number, because the mean of its divisors is an integer number (3536568).

Almost surely, 2^25778621 is an apocalyptic number.

It is an amenable number.

25778621 is a deficient number, since it is larger than the sum of its proper divisors (2513923).

25778621 is a wasteful number, since it uses less digits than its factorization.

25778621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14211.

The product of its digits is 47040, while the sum is 38.

The square root of 25778621 is about 5077.2651102734. The cubic root of 25778621 is about 295.4063957426.

The spelling of 25778621 in words is "twenty-five million, seven hundred seventy-eight thousand, six hundred twenty-one".