25271640 has 48 divisors (see below), whose sum is σ = 82134000. Its totient is φ = 6739008.

The previous prime is 25271633. The next prime is 25271657. The reversal of 25271640 is 4617252.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 34740 + ... + 35459.

It is an arithmetic number, because the mean of its divisors is an integer number (1711125).

Almost surely, 2^25271640 is an apocalyptic number.

25271640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25271640 is an abundant number, since it is smaller than the sum of its proper divisors (56862360).

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

25271640 is a wasteful number, since it uses less digits than its factorization.

25271640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70216 (or 70209 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 25271640 is about 5027.0906098856. The cubic root of 25271640 is about 293.4570013442.

Adding to 25271640 its reverse (4617252), we get a palindrome (29888892).

The spelling of 25271640 in words is "twenty-five million, two hundred seventy-one thousand, six hundred forty".