25997660 has 24 divisors (see below), whose sum is σ = 58795296. Its totient is φ = 9599040.

The previous prime is 25997639. The next prime is 25997677. The reversal of 25997660 is 6679952.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49736 + ... + 50255.

It is an arithmetic number, because the mean of its divisors is an integer number (2449804).

Almost surely, 2^25997660 is an apocalyptic number.

25997660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25997660 is an abundant number, since it is smaller than the sum of its proper divisors (32797636).

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

25997660 is a wasteful number, since it uses less digits than its factorization.

25997660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100013 (or 100011 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 25997660 is about 5098.7900525517. The cubic root of 25997660 is about 296.2407190859.

The spelling of 25997660 in words is "twenty-five million, nine hundred ninety-seven thousand, six hundred sixty".