25538730 has 64 divisors (see below), whose sum is σ = 72327168. Its totient is φ = 5647680.

The previous prime is 25538713. The next prime is 25538741. The reversal of 25538730 is 3783552.

It is a junction number, because it is equal to n+sod(n) for n = 25538691 and 25538700.

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 31 ways as a sum of consecutive naturals, for example, 4549 + ... + 8471.

It is an arithmetic number, because the mean of its divisors is an integer number (1130112).

Almost surely, 2^25538730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25538730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36163584).

25538730 is an abundant number, since it is smaller than the sum of its proper divisors (46788438).

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

25538730 is a wasteful number, since it uses less digits than its factorization.

25538730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3971.

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 25538730 is about 5053.5858556079. The cubic root of 25538730 is about 294.4872064260.

The spelling of 25538730 in words is "twenty-five million, five hundred thirty-eight thousand, seven hundred thirty".