25015816 has 32 divisors (see below), whose sum is σ = 54138240. Its totient is φ = 10614528.

The previous prime is 25015763. The next prime is 25015817. The reversal of 25015816 is 61851052.

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

It is not an unprimeable number, because it can be changed into a prime (25015817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3600 + ... + 7936.

It is an arithmetic number, because the mean of its divisors is an integer number (1691820).

Almost surely, 2^25015816 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 25015816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27069120).

25015816 is an abundant number, since it is smaller than the sum of its proper divisors (29122424).

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

25015816 is a wasteful number, since it uses less digits than its factorization.

25015816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4453 (or 4449 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 25015816 is about 5001.5813499332. The cubic root of 25015816 is about 292.4634225087.

Adding to 25015816 its reverse (61851052), we get a palindrome (86866868).

The spelling of 25015816 in words is "twenty-five million, fifteen thousand, eight hundred sixteen".