25971645 has 64 divisors (see below), whose sum is σ = 50135040. Its totient is φ = 11232000.

The previous prime is 25971641. The next prime is 25971661. The reversal of 25971645 is 54617952.

It is not a de Polignac number, because 25971645 - 2² = 25971641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25971641) 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, 257095 + ... + 257195.

It is an arithmetic number, because the mean of its divisors is an integer number (783360).

Almost surely, 2^25971645 is an apocalyptic number.

It is an amenable number.

25971645 is a deficient number, since it is larger than the sum of its proper divisors (24163395).

25971645 is a wasteful number, since it uses less digits than its factorization.

25971645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226.

The product of its digits is 75600, while the sum is 39.

The square root of 25971645 is about 5096.2383186032. The cubic root of 25971645 is about 296.1418733391.

The spelling of 25971645 in words is "twenty-five million, nine hundred seventy-one thousand, six hundred forty-five".