25768921 has 4 divisors (see below), whose sum is σ = 27125200. Its totient is φ = 24412644.

The previous prime is 25768903. The next prime is 25768943. The reversal of 25768921 is 12986752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25768921 - 2¹⁵ = 25736153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25768121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 678111 + ... + 678148.

It is an arithmetic number, because the mean of its divisors is an integer number (6781300).

Almost surely, 2^25768921 is an apocalyptic number.

It is an amenable number.

25768921 is a deficient number, since it is larger than the sum of its proper divisors (1356279).

25768921 is a wasteful number, since it uses less digits than its factorization.

25768921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356278.

The product of its digits is 60480, while the sum is 40.

The square root of 25768921 is about 5076.3097817214. The cubic root of 25768921 is about 295.3693391765.

The spelling of 25768921 in words is "twenty-five million, seven hundred sixty-eight thousand, nine hundred twenty-one".