25503030 has 72 divisors (see below), whose sum is σ = 77146992. Its totient is φ = 5828256.

The previous prime is 25503019. The next prime is 25503041. The reversal of 25503030 is 3030552.

It is an interprime number because it is at equal distance from previous prime (25503019) and next prime (25503041).

It is a Harshad number since it is a multiple of its sum of digits (18).

25503030 is a modest number, since divided by 3030 gives 2550 as remainder.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25502994 and 25503012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1519 + ... + 7301.

It is an arithmetic number, because the mean of its divisors is an integer number (1071486).

Almost surely, 2^25503030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25503030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38573496).

25503030 is an abundant number, since it is smaller than the sum of its proper divisors (51643962).

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

25503030 is a wasteful number, since it uses less digits than its factorization.

25503030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5810 (or 5800 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 18.

The square root of 25503030 is about 5050.0524749749. The cubic root of 25503030 is about 294.3499234863.

Adding to 25503030 its reverse (3030552), we get a palindrome (28533582).

The spelling of 25503030 in words is "twenty-five million, five hundred three thousand, thirty".