25747240 has 16 divisors (see below), whose sum is σ = 57931380. Its totient is φ = 10298880.

The previous prime is 25747237. The next prime is 25747247. The reversal of 25747240 is 4274752.

It can be written as a sum of positive squares in 2 ways, for example, as 25745476 + 1764 = 5074^2 + 42^2 .

It is not an unprimeable number, because it can be changed into a prime (25747247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321801 + ... + 321880.

Almost surely, 2^25747240 is an apocalyptic number.

25747240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25747240 is an abundant number, since it is smaller than the sum of its proper divisors (32184140).

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

25747240 is a wasteful number, since it uses less digits than its factorization.

25747240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643692 (or 643688 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 31.

The square root of 25747240 is about 5074.1738243777. The cubic root of 25747240 is about 295.2864783861.

The spelling of 25747240 in words is "twenty-five million, seven hundred forty-seven thousand, two hundred forty".