25997760 has 280 divisors, whose sum is σ = 99578160. Its totient is φ = 6414336.

The previous prime is 25997749. The next prime is 25997761. The reversal of 25997760 is 6779952.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25997761) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 440611 + ... + 440669.

Almost surely, 2^25997760 is an apocalyptic number.

25997760 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 25997760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49789080).

25997760 is an abundant number, since it is smaller than the sum of its proper divisors (73580400).

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

25997760 is a wasteful number, since it uses less digits than its factorization.

25997760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 45.

The square root of 25997760 is about 5098.7998587903. The cubic root of 25997760 is about 296.2410989154.

The spelling of 25997760 in words is "twenty-five million, nine hundred ninety-seven thousand, seven hundred sixty".