25665920 has 128 divisors (see below), whose sum is σ = 74468160. Its totient is φ = 8257536.

The previous prime is 25665911. The next prime is 25665929. The reversal of 25665920 is 2956652.

It is an interprime number because it is at equal distance from previous prime (25665911) and next prime (25665929).

It is a tau number, because it is divible by the number of its divisors (128).

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25665929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75992 + ... + 76328.

Almost surely, 2^25665920 is an apocalyptic number.

25665920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25665920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37234080).

25665920 is an abundant number, since it is smaller than the sum of its proper divisors (48802240).

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

25665920 is a wasteful number, since it uses less digits than its factorization.

25665920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 25665920 is about 5066.1543600644. The cubic root of 25665920 is about 294.9752732315.

The spelling of 25665920 in words is "twenty-five million, six hundred sixty-five thousand, nine hundred twenty".