25778016 has 144 divisors (see below), whose sum is σ = 81768960. Its totient is φ = 7637760.

The previous prime is 25777993. The next prime is 25778021. The reversal of 25778016 is 61087752.

25778016 is a `hidden beast` number, since 2 + 577 + 80 + 1 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×25778016² = 1329012217792512, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 250221 + ... + 250323.

It is an arithmetic number, because the mean of its divisors is an integer number (567840).

Almost surely, 2^25778016 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 25778016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40884480).

25778016 is an abundant number, since it is smaller than the sum of its proper divisors (55990944).

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

25778016 is a wasteful number, since it uses less digits than its factorization.

25778016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 25778016 is about 5077.2055306044. The cubic root of 25778016 is about 295.4040847544.

The spelling of 25778016 in words is "twenty-five million, seven hundred seventy-eight thousand, sixteen".