25161728 has 26 divisors (see below), whose sum is σ = 50325504. Its totient is φ = 12578816.

The previous prime is 25161727. The next prime is 25161743. The reversal of 25161728 is 82716152.

25161728 is an admirable number.

It is a super-2 number, since 2×25161728² = 1266225111891968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 25161694 and 25161703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25161727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1025 + ... + 7167.

Almost surely, 2^25161728 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 25161728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25162752).

25161728 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

25161728 is an frugal number, since it uses more digits than its factorization.

25161728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6167 (or 6145 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

The square root of 25161728 is about 5016.1467283165. The cubic root of 25161728 is about 293.0309464221.

The spelling of 25161728 in words is "twenty-five million, one hundred sixty-one thousand, seven hundred twenty-eight".