25640006 has 32 divisors (see below), whose sum is σ = 47416320. Its totient is φ = 10152000.

The previous prime is 25639981. The next prime is 25640023. The reversal of 25640006 is 60004652.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9731 + ... + 12081.

It is an arithmetic number, because the mean of its divisors is an integer number (1481760).

Almost surely, 2^25640006 is an apocalyptic number.

25640006 is a deficient number, since it is larger than the sum of its proper divisors (21776314).

25640006 is a wasteful number, since it uses less digits than its factorization.

25640006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 25640006 is about 5063.5961529332. The cubic root of 25640006 is about 294.8759643256.

Adding to 25640006 its reverse (60004652), we get a palindrome (85644658).

The spelling of 25640006 in words is "twenty-five million, six hundred forty thousand, six".