25216040 has 32 divisors (see below), whose sum is σ = 59724000. Its totient is φ = 9555264.

The previous prime is 25216039. The next prime is 25216043. The reversal of 25216040 is 4061252.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (25216043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15830 + ... + 17349.

It is an arithmetic number, because the mean of its divisors is an integer number (1866375).

Almost surely, 2^25216040 is an apocalyptic number.

25216040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25216040 is an abundant number, since it is smaller than the sum of its proper divisors (34507960).

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

25216040 is a wasteful number, since it uses less digits than its factorization.

25216040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33209 (or 33205 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 25216040 is about 5021.5575273017. The cubic root of 25216040 is about 293.2416322631.

Adding to 25216040 its reverse (4061252), we get a palindrome (29277292).

The spelling of 25216040 in words is "twenty-five million, two hundred sixteen thousand, forty".