25772240 has 40 divisors (see below), whose sum is σ = 64532328. Its totient is φ = 9515520.

The previous prime is 25772207. The next prime is 25772267. The reversal of 25772240 is 4227752.

It can be written as a sum of positive squares in 4 ways, for example, as 87616 + 25684624 = 296^2 + 5068^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11351 + ... + 13430.

Almost surely, 2^25772240 is an apocalyptic number.

25772240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25772240 is an abundant number, since it is smaller than the sum of its proper divisors (38760088).

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

25772240 is a wasteful number, since it uses less digits than its factorization.

25772240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24807 (or 24801 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 29.

The square root of 25772240 is about 5076.6366818988. The cubic root of 25772240 is about 295.3820196809.

Adding to 25772240 its reverse (4227752), we get a palindrome (29999992).

The spelling of 25772240 in words is "twenty-five million, seven hundred seventy-two thousand, two hundred forty".