25171664 has 40 divisors (see below), whose sum is σ = 55978560. Its totient is φ = 10741248.

The previous prime is 25171633. The next prime is 25171669. The reversal of 25171664 is 46617152.

It is a super-2 number, since 2×25171664² = 1267225337057792, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25171664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25171669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42152 + ... + 42744.

It is an arithmetic number, because the mean of its divisors is an integer number (1399464).

Almost surely, 2^25171664 is an apocalyptic number.

It is an amenable number.

25171664 is an abundant number, since it is smaller than the sum of its proper divisors (30806896).

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

25171664 is a wasteful number, since it uses less digits than its factorization.

25171664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987 (or 981 counting only the distinct ones).

The product of its digits is 10080, while the sum is 32.

The square root of 25171664 is about 5017.1370322127. The cubic root of 25171664 is about 293.0695125641.

The spelling of 25171664 in words is "twenty-five million, one hundred seventy-one thousand, six hundred sixty-four".