25217730 has 80 divisors (see below), whose sum is σ = 68580864. Its totient is φ = 6648480.

The previous prime is 25217659. The next prime is 25217743. The reversal of 25217730 is 3771252.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 25217694 and 25217703.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 131935 + ... + 132125.

Almost surely, 2^25217730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25217730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34290432).

25217730 is an abundant number, since it is smaller than the sum of its proper divisors (43363134).

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

25217730 is a wasteful number, since it uses less digits than its factorization.

25217730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 25217730 is about 5021.7257989659. The cubic root of 25217730 is about 293.2481832162.

Adding to 25217730 its reverse (3771252), we get a palindrome (28988982).

The spelling of 25217730 in words is "twenty-five million, two hundred seventeen thousand, seven hundred thirty".