25471440 has 120 divisors (see below), whose sum is σ = 90616968. Its totient is φ = 6389760.

The previous prime is 25471393. The next prime is 25471469. The reversal of 25471440 is 4417452.

It can be written as a sum of positive squares in 4 ways, for example, as 4016016 + 21455424 = 2004^2 + 4632^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11200 + ... + 13280.

Almost surely, 2^25471440 is an apocalyptic number.

25471440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25471440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45308484).

25471440 is an abundant number, since it is smaller than the sum of its proper divisors (65145528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25471440 is a wasteful number, since it uses less digits than its factorization.

25471440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117 (or 2108 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 25471440 is about 5046.9238155534. The cubic root of 25471440 is about 294.2283385085.

Adding to 25471440 its reverse (4417452), we get a palindrome (29888892).

The spelling of 25471440 in words is "twenty-five million, four hundred seventy-one thousand, four hundred forty".