25117830 has 64 divisors (see below), whose sum is σ = 68644800. Its totient is φ = 6531840.

The previous prime is 25117801. The next prime is 25117853. The reversal of 25117830 is 3871152.

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 = 25117794 and 25117803.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9936 + ... + 12204.

It is an arithmetic number, because the mean of its divisors is an integer number (1072575).

Almost surely, 2^25117830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25117830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34322400).

25117830 is an abundant number, since it is smaller than the sum of its proper divisors (43526970).

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

25117830 is a wasteful number, since it uses less digits than its factorization.

25117830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2326 (or 2320 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 25117830 is about 5011.7691487139. The cubic root of 25117830 is about 292.8604366645.

Adding to 25117830 its reverse (3871152), we get a palindrome (28988982).

It can be divided in two parts, 251 and 17830, that added together give a palindrome (18081).

The spelling of 25117830 in words is "twenty-five million, one hundred seventeen thousand, eight hundred thirty".