25615616 has 72 divisors (see below), whose sum is σ = 56659680. Its totient is φ = 11483136.

The previous prime is 25615571. The next prime is 25615619. The reversal of 25615616 is 61651652.

It is a super-4 number, since 4×25615616⁴ (a number of 31 digits) contains 4444 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25615619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143015 + ... + 143193.

It is an arithmetic number, because the mean of its divisors is an integer number (786940).

Almost surely, 2^25615616 is an apocalyptic number.

25615616 is a gapful number since it is divisible by the number (26) 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 25615616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28329840).

25615616 is an abundant number, since it is smaller than the sum of its proper divisors (31044064).

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

25615616 is a wasteful number, since it uses less digits than its factorization.

25615616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251 (or 237 counting only the distinct ones).

The product of its digits is 10800, while the sum is 32.

The square root of 25615616 is about 5061.1872125026. The cubic root of 25615616 is about 294.7824346226.

The spelling of 25615616 in words is "twenty-five million, six hundred fifteen thousand, six hundred sixteen".