25717280 has 48 divisors (see below), whose sum is σ = 61689600. Its totient is φ = 10129152.

The previous prime is 25717267. The next prime is 25717283. The reversal of 25717280 is 8271752.

It is a super-2 number, since 2×25717280² = 1322756981196800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (25717283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9521 + ... + 11919.

It is an arithmetic number, because the mean of its divisors is an integer number (1285200).

Almost surely, 2^25717280 is an apocalyptic number.

25717280 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 25717280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30844800).

25717280 is an abundant number, since it is smaller than the sum of its proper divisors (35972320).

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

25717280 is a wasteful number, since it uses less digits than its factorization.

25717280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2481 (or 2473 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 25717280 is about 5071.2207603298. The cubic root of 25717280 is about 295.1719001952.

The spelling of 25717280 in words is "twenty-five million, seven hundred seventeen thousand, two hundred eighty".