25643072 has 168 divisors, whose sum is σ = 69320664. Its totient is φ = 9289728.

The previous prime is 25643071. The next prime is 25643083. The reversal of 25643072 is 27034652.

It can be written as a sum of positive squares in 4 ways, for example, as 7529536 + 18113536 = 2744^2 + 4256^2 .

It is not an unprimeable number, because it can be changed into a prime (25643071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 693038 + ... + 693074.

It is an arithmetic number, because the mean of its divisors is an integer number (412623).

Almost surely, 2^25643072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25643072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34660332).

25643072 is an abundant number, since it is smaller than the sum of its proper divisors (43677592).

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

25643072 is a wasteful number, since it uses less digits than its factorization.

25643072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 25643072 is about 5063.8988931455. The cubic root of 25643072 is about 294.8877174908.

The spelling of 25643072 in words is "twenty-five million, six hundred forty-three thousand, seventy-two".