25128164 has 12 divisors (see below), whose sum is σ = 44255484. Its totient is φ = 12483744.

The previous prime is 25128161. The next prime is 25128223. The reversal of 25128164 is 46182152.

It can be written as a sum of positive squares in 2 ways, for example, as 9048064 + 16080100 = 3008^2 + 4010^2 .

It is not an unprimeable number, because it can be changed into a prime (25128161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19379 + ... + 20634.

It is an arithmetic number, because the mean of its divisors is an integer number (3687957).

Almost surely, 2^25128164 is an apocalyptic number.

It is an amenable number.

25128164 is a deficient number, since it is larger than the sum of its proper divisors (19127320).

25128164 is a wasteful number, since it uses less digits than its factorization.

25128164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40174 (or 40172 counting only the distinct ones).

The product of its digits is 3840, while the sum is 29.

The square root of 25128164 is about 5012.8000159591. The cubic root of 25128164 is about 292.9005941250.

It can be divided in two parts, 25 and 128164, that multiplied together give a square (3204100 = 1790²).

The spelling of 25128164 in words is "twenty-five million, one hundred twenty-eight thousand, one hundred sixty-four".