25389780 has 96 divisors (see below), whose sum is σ = 78443904. Its totient is φ = 6096384.

The previous prime is 25389773. The next prime is 25389781. The reversal of 25389780 is 8798352.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25389781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33162 + ... + 33918.

It is an arithmetic number, because the mean of its divisors is an integer number (817124).

Almost surely, 2^25389780 is an apocalyptic number.

25389780 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 25389780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39221952).

25389780 is an abundant number, since it is smaller than the sum of its proper divisors (53054124).

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

25389780 is a wasteful number, since it uses less digits than its factorization.

25389780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825 (or 823 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 25389780 is about 5038.8272445084. The cubic root of 25389780 is about 293.9135754115.

The spelling of 25389780 in words is "twenty-five million, three hundred eighty-nine thousand, seven hundred eighty".