25758816 has 48 divisors (see below), whose sum is σ = 68040000. Its totient is φ = 8532608.

The previous prime is 25758793. The next prime is 25758823. The reversal of 25758816 is 61885752.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16435 + ... + 17933.

It is an arithmetic number, because the mean of its divisors is an integer number (1417500).

Almost surely, 2^25758816 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 25758816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34020000).

25758816 is an abundant number, since it is smaller than the sum of its proper divisors (42281184).

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

25758816 is a wasteful number, since it uses less digits than its factorization.

25758816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691 (or 1683 counting only the distinct ones).

The product of its digits is 134400, while the sum is 42.

The square root of 25758816 is about 5075.3143744994. The cubic root of 25758816 is about 295.3307255122.

The spelling of 25758816 in words is "twenty-five million, seven hundred fifty-eight thousand, eight hundred sixteen".