25755640 has 32 divisors (see below), whose sum is σ = 61002000. Its totient is φ = 9759744.

The previous prime is 25755619. The next prime is 25755661. The reversal of 25755640 is 4655752.

It is an interprime number because it is at equal distance from previous prime (25755619) and next prime (25755661).

It is a junction number, because it is equal to n+sod(n) for n = 25755596 and 25755605.

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, 16185 + ... + 17704.

Almost surely, 2^25755640 is an apocalyptic number.

25755640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25755640 is an abundant number, since it is smaller than the sum of its proper divisors (35246360).

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

25755640 is a wasteful number, since it uses less digits than its factorization.

25755640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33919 (or 33915 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 34.

The square root of 25755640 is about 5075.0014778323. The cubic root of 25755640 is about 295.3185871575.

The spelling of 25755640 in words is "twenty-five million, seven hundred fifty-five thousand, six hundred forty".