25255440 has 120 divisors (see below), whose sum is σ = 96952128. Its totient is φ = 5771520.

The previous prime is 25255429. The next prime is 25255463. The reversal of 25255440 is 4455252.

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

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, 2535 + ... + 7545.

Almost surely, 2^25255440 is an apocalyptic number.

25255440 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 25255440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48476064).

25255440 is an abundant number, since it is smaller than the sum of its proper divisors (71696688).

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

25255440 is a wasteful number, since it uses less digits than its factorization.

25255440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5037 (or 5028 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 27.

The square root of 25255440 is about 5025.4790816399. The cubic root of 25255440 is about 293.3942825600.

The spelling of 25255440 in words is "twenty-five million, two hundred fifty-five thousand, four hundred forty".