25271730 has 128 divisors (see below), whose sum is σ = 75202560. Its totient is φ = 5987520.

The previous prime is 25271723. The next prime is 25271737. The reversal of 25271730 is 3717252.

It is an interprime number because it is at equal distance from previous prime (25271723) and next prime (25271737).

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25271694 and 25271703.

It is not an unprimeable number, because it can be changed into a prime (25271737) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 198927 + ... + 199053.

It is an arithmetic number, because the mean of its divisors is an integer number (587520).

Almost surely, 2^25271730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25271730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37601280).

25271730 is an abundant number, since it is smaller than the sum of its proper divisors (49930830).

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

25271730 is a wasteful number, since it uses less digits than its factorization.

25271730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 215 counting only the distinct ones).

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

The square root of 25271730 is about 5027.0995613773. The cubic root of 25271730 is about 293.4573497070.

Adding to 25271730 its reverse (3717252), we get a palindrome (28988982).

The spelling of 25271730 in words is "twenty-five million, two hundred seventy-one thousand, seven hundred thirty".