25530780 has 96 divisors (see below), whose sum is σ = 78962688. Its totient is φ = 6112000.

The previous prime is 25530773. The next prime is 25530781. The reversal of 25530780 is 8703552.

It is a happy number.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25530781) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 66469 + ... + 66851.

It is an arithmetic number, because the mean of its divisors is an integer number (822528).

Almost surely, 2^25530780 is an apocalyptic number.

25530780 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 25530780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39481344).

25530780 is an abundant number, since it is smaller than the sum of its proper divisors (53431908).

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

25530780 is a wasteful number, since it uses less digits than its factorization.

25530780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507 (or 505 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 25530780 is about 5052.7992241925. The cubic root of 25530780 is about 294.4566460933.

The spelling of 25530780 in words is "twenty-five million, five hundred thirty thousand, seven hundred eighty".