25051440 has 40 divisors (see below), whose sum is σ = 77660208. Its totient is φ = 6680320.

The previous prime is 25051417. The next prime is 25051469. The reversal of 25051440 is 4415052.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 51951 + ... + 52430.

Almost surely, 2^25051440 is an apocalyptic number.

25051440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25051440 is an abundant number, since it is smaller than the sum of its proper divisors (52608768).

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

25051440 is a wasteful number, since it uses less digits than its factorization.

25051440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104397 (or 104391 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 25051440 is about 5005.1413566452. The cubic root of 25051440 is about 292.6021850586.

Adding to 25051440 its reverse (4415052), we get a palindrome (29466492).

The spelling of 25051440 in words is "twenty-five million, fifty-one thousand, four hundred forty".