25421616 has 90 divisors (see below), whose sum is σ = 78254540. Its totient is φ = 7698240.

The previous prime is 25421611. The next prime is 25421629. The reversal of 25421616 is 61612452.

25421616 is a `hidden beast` number, since 2 + 5 + 42 + 1 + 616 = 666.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 25421616.

It is not an unprimeable number, because it can be changed into a prime (25421611) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16695 + ... + 18153.

Almost surely, 2^25421616 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 25421616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39127270).

25421616 is an abundant number, since it is smaller than the sum of its proper divisors (52832924).

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

25421616 is a wasteful number, since it uses less digits than its factorization.

25421616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495 (or 1475 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 25421616 is about 5041.9853232630. The cubic root of 25421616 is about 294.0363692339.

The spelling of 25421616 in words is "twenty-five million, four hundred twenty-one thousand, six hundred sixteen".