25671330 has 80 divisors (see below), whose sum is σ = 70802424. Its totient is φ = 6670080.

The previous prime is 25671329. The next prime is 25671361. The reversal of 25671330 is 3317652.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7241481 + 18429849 = 2691^2 + 4293^2 .

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 = 25671294 and 25671303.

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 39 ways as a sum of consecutive naturals, for example, 32824 + ... + 33596.

Almost surely, 2^25671330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25671330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35401212).

25671330 is an abundant number, since it is smaller than the sum of its proper divisors (45131094).

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

25671330 is a wasteful number, since it uses less digits than its factorization.

25671330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833 (or 824 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 25671330 is about 5066.6882674978. The cubic root of 25671330 is about 294.9959972645.

Adding to 25671330 its reverse (3317652), we get a palindrome (28988982).

The spelling of 25671330 in words is "twenty-five million, six hundred seventy-one thousand, three hundred thirty".