25220016 has 60 divisors (see below), whose sum is σ = 72240168. Its totient is φ = 8209152.

The previous prime is 25219991. The next prime is 25220033. The reversal of 25220016 is 61002252.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4156 + ... + 8228.

Almost surely, 2^25220016 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 25220016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36120084).

25220016 is an abundant number, since it is smaller than the sum of its proper divisors (47020152).

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

25220016 is a wasteful number, since it uses less digits than its factorization.

25220016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4130 (or 4121 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 25220016 is about 5021.9534048018. The cubic root of 25220016 is about 293.2570439806.

Adding to 25220016 its reverse (61002252), we get a palindrome (86222268).

The spelling of 25220016 in words is "twenty-five million, two hundred twenty thousand, sixteen".