25216660 has 48 divisors (see below), whose sum is σ = 62616960. Its totient is φ = 8346240.

The previous prime is 25216657. The next prime is 25216669. The reversal of 25216660 is 6661252.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25216669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 955 + ... + 7165.

It is an arithmetic number, because the mean of its divisors is an integer number (1304520).

Almost surely, 2^25216660 is an apocalyptic number.

25216660 is a gapful number since it is divisible by the number (20) 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 25216660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31308480).

25216660 is an abundant number, since it is smaller than the sum of its proper divisors (37400300).

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

25216660 is a wasteful number, since it uses less digits than its factorization.

25216660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6256 (or 6254 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 25216660 is about 5021.6192607564. The cubic root of 25216660 is about 293.2440356053.

The spelling of 25216660 in words is "twenty-five million, two hundred sixteen thousand, six hundred sixty".