25491456 has 96 divisors (see below), whose sum is σ = 75675600. Its totient is φ = 8478720.

The previous prime is 25491443. The next prime is 25491457. The reversal of 25491456 is 65419452.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 25491456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25491457) 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, 55066 + ... + 55526.

Almost surely, 2^25491456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25491456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37837800).

25491456 is an abundant number, since it is smaller than the sum of its proper divisors (50184144).

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

25491456 is an equidigital number, since it uses as much as digits as its factorization.

25491456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492 (or 466 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 25491456 is about 5048.9064162450. The cubic root of 25491456 is about 294.3053886276.

It can be divided in two parts, 2549 and 1456, that added together give a triangular number (4005 = T₈₉).

The spelling of 25491456 in words is "twenty-five million, four hundred ninety-one thousand, four hundred fifty-six".