25550730 has 48 divisors (see below), whose sum is σ = 67359240. Its totient is φ = 6718464.

The previous prime is 25550663. The next prime is 25550731. The reversal of 25550730 is 3705552.

It can be written as a sum of positive squares in 4 ways, for example, as 23126481 + 2424249 = 4809^2 + 1557^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25550694 and 25550703.

It is not an unprimeable number, because it can be changed into a prime (25550731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4626 + ... + 8514.

Almost surely, 2^25550730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25550730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33679620).

25550730 is an abundant number, since it is smaller than the sum of its proper divisors (41808510).

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

25550730 is a wasteful number, since it uses less digits than its factorization.

25550730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3975 (or 3972 counting only the distinct ones).

The product of its (nonzero) digits is 5250, while the sum is 27.

The square root of 25550730 is about 5054.7729919354. The cubic root of 25550730 is about 294.5333232211.

The spelling of 25550730 in words is "twenty-five million, five hundred fifty thousand, seven hundred thirty".