25279616 has 32 divisors (see below), whose sum is σ = 51600780. Its totient is φ = 12328960.

The previous prime is 25279613. The next prime is 25279627. The reversal of 25279616 is 61697252.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19009600 + 6270016 = 4360^2 + 2504^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 25279616.

It is not an unprimeable number, because it can be changed into a prime (25279613) 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, 2840 + ... + 7656.

Almost surely, 2^25279616 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 25279616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25800390).

25279616 is an abundant number, since it is smaller than the sum of its proper divisors (26321164).

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

25279616 is an equidigital number, since it uses as much as digits as its factorization.

25279616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4872 (or 4860 counting only the distinct ones).

The product of its digits is 45360, while the sum is 38.

The square root of 25279616 is about 5027.8838490960. The cubic root of 25279616 is about 293.4878708201.

The spelling of 25279616 in words is "twenty-five million, two hundred seventy-nine thousand, six hundred sixteen".