25421764 has 9 divisors (see below), whose sum is σ = 44505741. Its totient is φ = 12705840.

The previous prime is 25421761. The next prime is 25421771. The reversal of 25421764 is 46712452.

The square root of 25421764 is 5042.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 20164 + 25401600 = 142^2 + 5040^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25421761) 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 2 ways as a sum of consecutive naturals, for example, 8824 + ... + 11344.

Almost surely, 2^25421764 is an apocalyptic number.

25421764 is the 5042-nd square number.

It is an amenable number.

25421764 is a deficient number, since it is larger than the sum of its proper divisors (19083977).

25421764 is an frugal number, since it uses more digits than its factorization.

25421764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5046 (or 2523 counting only the distinct ones).

The product of its digits is 13440, while the sum is 31.

The cubic root of 25421764 is about 294.0369398415.

The spelling of 25421764 in words is "twenty-five million, four hundred twenty-one thousand, seven hundred sixty-four".