25765520 has 160 divisors (see below), whose sum is σ = 72852480. Its totient is φ = 8363520.

The previous prime is 25765517. The next prime is 25765547. The reversal of 25765520 is 2556752.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 384527 + ... + 384593.

It is an arithmetic number, because the mean of its divisors is an integer number (455328).

Almost surely, 2^25765520 is an apocalyptic number.

25765520 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 25765520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36426240).

25765520 is an abundant number, since it is smaller than the sum of its proper divisors (47086960).

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

25765520 is a wasteful number, since it uses less digits than its factorization.

25765520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 32.

The square root of 25765520 is about 5075.9747832313. The cubic root of 25765520 is about 295.3563442550.

The spelling of 25765520 in words is "twenty-five million, seven hundred sixty-five thousand, five hundred twenty".