25211616 has 24 divisors (see below), whose sum is σ = 66180744. Its totient is φ = 8403840.

The previous prime is 25211609. The next prime is 25211617. The reversal of 25211616 is 61611252.

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25211617) 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, 131215 + ... + 131406.

It is an arithmetic number, because the mean of its divisors is an integer number (2757531).

Almost surely, 2^25211616 is an apocalyptic number.

It is an amenable number.

25211616 is an abundant number, since it is smaller than the sum of its proper divisors (40969128).

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

25211616 is a wasteful number, since it uses less digits than its factorization.

25211616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262634 (or 262626 counting only the distinct ones).

The product of its digits is 720, while the sum is 24.

The square root of 25211616 is about 5021.1170072007. The cubic root of 25211616 is about 293.2244821098.

Adding to 25211616 its reverse (61611252), we get a palindrome (86822868).

The spelling of 25211616 in words is "twenty-five million, two hundred eleven thousand, six hundred sixteen".