25697280 has 176 divisors, whose sum is σ = 94325760. Its totient is φ = 5849088.

The previous prime is 25697267. The next prime is 25697281. The reversal of 25697280 is 8279652.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25697281) 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, 107401 + ... + 107639.

Almost surely, 2^25697280 is an apocalyptic number.

25697280 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 25697280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47162880).

25697280 is an abundant number, since it is smaller than the sum of its proper divisors (68628480).

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

25697280 is a wasteful number, since it uses less digits than its factorization.

25697280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 25697280 is about 5069.2484650094. The cubic root of 25697280 is about 295.0953632129.

The spelling of 25697280 in words is "twenty-five million, six hundred ninety-seven thousand, two hundred eighty".