25812780 has 96 divisors (see below), whose sum is σ = 84672000. Its totient is φ = 5752320.

The previous prime is 25812769. The next prime is 25812781. The reversal of 25812780 is 8721852.

It is a super-2 number, since 2×25812780² = 1332599222656800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25812781) 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, 16471 + ... + 17969.

It is an arithmetic number, because the mean of its divisors is an integer number (882000).

Almost surely, 2^25812780 is an apocalyptic number.

25812780 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 25812780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42336000).

25812780 is an abundant number, since it is smaller than the sum of its proper divisors (58859220).

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

25812780 is a wasteful number, since it uses less digits than its factorization.

25812780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559 (or 1557 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 25812780 is about 5080.6279139492. The cubic root of 25812780 is about 295.5368181998.

The spelling of 25812780 in words is "twenty-five million, eight hundred twelve thousand, seven hundred eighty".