25721284 has 6 divisors (see below), whose sum is σ = 45012254. Its totient is φ = 12860640.

The previous prime is 25721281. The next prime is 25721287. The reversal of 25721284 is 48212752.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25721281) and next prime (25721287).

It can be written as a sum of positive squares in only one way, i.e., 25704900 + 16384 = 5070^2 + 128^2 .

It is not an unprimeable number, because it can be changed into a prime (25721281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3215157 + ... + 3215164.

Almost surely, 2^25721284 is an apocalyptic number.

It is an amenable number.

25721284 is a deficient number, since it is larger than the sum of its proper divisors (19290970).

25721284 is a wasteful number, since it uses less digits than its factorization.

25721284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6430325 (or 6430323 counting only the distinct ones).

The product of its digits is 8960, while the sum is 31.

The square root of 25721284 is about 5071.6155217051. The cubic root of 25721284 is about 295.1872181313.

The spelling of 25721284 in words is "twenty-five million, seven hundred twenty-one thousand, two hundred eighty-four".