25707920 has 80 divisors (see below), whose sum is σ = 70709760. Its totient is φ = 8504832.

The previous prime is 25707887. The next prime is 25707947. The reversal of 25707920 is 2970752.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15449 + ... + 17031.

It is an arithmetic number, because the mean of its divisors is an integer number (883872).

Almost surely, 2^25707920 is an apocalyptic number.

25707920 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 25707920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35354880).

25707920 is an abundant number, since it is smaller than the sum of its proper divisors (45001840).

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

25707920 is a wasteful number, since it uses less digits than its factorization.

25707920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632 (or 1626 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 25707920 is about 5070.2978216274. The cubic root of 25707920 is about 295.1360858292.

The spelling of 25707920 in words is "twenty-five million, seven hundred seven thousand, nine hundred twenty".