25640010 has 128 divisors (see below), whose sum is σ = 76204800. Its totient is φ = 6082560.

The previous prime is 25639981. The next prime is 25640023. The reversal of 25640010 is 1004652.

It is a happy number.

25640010 is a `hidden beast` number, since 25 + 640 + 0 + 1 + 0 = 666.

It is a super-2 number, since 2×25640010² = 1314820225600200, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 264282 + ... + 264378.

It is an arithmetic number, because the mean of its divisors is an integer number (595350).

Almost surely, 2^25640010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25640010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38102400).

25640010 is an abundant number, since it is smaller than the sum of its proper divisors (50564790).

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

25640010 is a wasteful number, since it uses less digits than its factorization.

25640010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 25640010 is about 5063.5965479094. The cubic root of 25640010 is about 294.8759796598.

Adding to 25640010 its reverse (1004652), we get a palindrome (26644662).

The spelling of 25640010 in words is "twenty-five million, six hundred forty thousand, ten".