25881720 has 32 divisors (see below), whose sum is σ = 77645520. Its totient is φ = 6901760.

The previous prime is 25881719. The next prime is 25881721. The reversal of 25881720 is 2718852.

It is an interprime number because it is at equal distance from previous prime (25881719) and next prime (25881721).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25881721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107721 + ... + 107960.

Almost surely, 2^25881720 is an apocalyptic number.

25881720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25881720 is an abundant number, since it is smaller than the sum of its proper divisors (51763800).

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

25881720 is a wasteful number, since it uses less digits than its factorization.

25881720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215695 (or 215691 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 25881720 is about 5087.4079844259. The cubic root of 25881720 is about 295.7996879455.

The spelling of 25881720 in words is "twenty-five million, eight hundred eighty-one thousand, seven hundred twenty".