25128972 has 144 divisors (see below), whose sum is σ = 75479040. Its totient is φ = 6969600.

The previous prime is 25128947. The next prime is 25128977. The reversal of 25128972 is 27982152.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (25128977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 282304 + ... + 282392.

It is an arithmetic number, because the mean of its divisors is an integer number (524160).

Almost surely, 2^25128972 is an apocalyptic number.

25128972 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25128972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37739520).

25128972 is an abundant number, since it is smaller than the sum of its proper divisors (50350068).

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

25128972 is a wasteful number, since it uses less digits than its factorization.

25128972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 159 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 25128972 is about 5012.8806089912. The cubic root of 25128972 is about 292.9037335127.

The spelling of 25128972 in words is "twenty-five million, one hundred twenty-eight thousand, nine hundred seventy-two".