25455840 has 96 divisors (see below), whose sum is σ = 80904096. Its totient is φ = 6727680.

The previous prime is 25455827. The next prime is 25455853. The reversal of 25455840 is 4855452.

It is an interprime number because it is at equal distance from previous prime (25455827) and next prime (25455853).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86734 + ... + 87026.

It is an arithmetic number, because the mean of its divisors is an integer number (842751).

Almost surely, 2^25455840 is an apocalyptic number.

25455840 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 25455840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40452048).

25455840 is an abundant number, since it is smaller than the sum of its proper divisors (55448256).

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

25455840 is a wasteful number, since it uses less digits than its factorization.

25455840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 33.

The square root of 25455840 is about 5045.3780829587. The cubic root of 25455840 is about 294.1682594626.

It can be divided in two parts, 2545 and 5840, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 25455840 in words is "twenty-five million, four hundred fifty-five thousand, eight hundred forty".