25761440 has 24 divisors (see below), whose sum is σ = 60861780. Its totient is φ = 10304512.

The previous prime is 25761391. The next prime is 25761451. The reversal of 25761440 is 4416752.

It can be written as a sum of positive squares in 2 ways, for example, as 21418384 + 4343056 = 4628^2 + 2084^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80345 + ... + 80664.

Almost surely, 2^25761440 is an apocalyptic number.

25761440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25761440 is an abundant number, since it is smaller than the sum of its proper divisors (35100340).

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

25761440 is a wasteful number, since it uses less digits than its factorization.

25761440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161024 (or 161016 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 25761440 is about 5075.5728740705. The cubic root of 25761440 is about 295.3407534253.

The spelling of 25761440 in words is "twenty-five million, seven hundred sixty-one thousand, four hundred forty".