25989720 has 64 divisors (see below), whose sum is σ = 82080000. Its totient is φ = 6565248.

The previous prime is 25989697. The next prime is 25989727. The reversal of 25989720 is 2798952.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25989727) 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, 3420 + ... + 7979.

It is an arithmetic number, because the mean of its divisors is an integer number (1282500).

Almost surely, 2^25989720 is an apocalyptic number.

25989720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25989720 is an abundant number, since it is smaller than the sum of its proper divisors (56090280).

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

25989720 is a wasteful number, since it uses less digits than its factorization.

25989720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11432 (or 11428 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 25989720 is about 5098.0113769979. The cubic root of 25989720 is about 296.2105575148.

The spelling of 25989720 in words is "twenty-five million, nine hundred eighty-nine thousand, seven hundred twenty".