25778880 has 84 divisors (see below), whose sum is σ = 88678512. Its totient is φ = 6873600.

The previous prime is 25778833. The next prime is 25778897. The reversal of 25778880 is 8887752.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1596 + ... + 7355.

Almost surely, 2^25778880 is an apocalyptic number.

25778880 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 25778880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44339256).

25778880 is an abundant number, since it is smaller than the sum of its proper divisors (62899632).

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

25778880 is a wasteful number, since it uses less digits than its factorization.

25778880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8974 (or 8961 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 45.

The square root of 25778880 is about 5077.2906160668. The cubic root of 25778880 is about 295.4073850637.

The spelling of 25778880 in words is "twenty-five million, seven hundred seventy-eight thousand, eight hundred eighty".