25505680 has 40 divisors (see below), whose sum is σ = 59621184. Its totient is φ = 10147200.

The previous prime is 25505677. The next prime is 25505693. The reversal of 25505680 is 8650552.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16125 + ... + 17635.

Almost surely, 2^25505680 is an apocalyptic number.

25505680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25505680 is an abundant number, since it is smaller than the sum of its proper divisors (34115504).

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

25505680 is a wasteful number, since it uses less digits than its factorization.

25505680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1735 (or 1729 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 25505680 is about 5050.3148416708. The cubic root of 25505680 is about 294.3601183570.

The spelling of 25505680 in words is "twenty-five million, five hundred five thousand, six hundred eighty".