25780872 has 64 divisors (see below), whose sum is σ = 73080000. Its totient is φ = 7513344.

The previous prime is 25780849. The next prime is 25780877. The reversal of 25780872 is 27808752.

It is a super-2 number, since 2×25780872² = 1329306722160768, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 25780872.

It is not an unprimeable number, because it can be changed into a prime (25780877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3754 + ... + 8102.

It is an arithmetic number, because the mean of its divisors is an integer number (1141875).

Almost surely, 2^25780872 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 25780872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36540000).

25780872 is an abundant number, since it is smaller than the sum of its proper divisors (47299128).

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

25780872 is a wasteful number, since it uses less digits than its factorization.

25780872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4390 (or 4386 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 39.

The square root of 25780872 is about 5077.4867798942. The cubic root of 25780872 is about 295.4149938291.

The spelling of 25780872 in words is "twenty-five million, seven hundred eighty thousand, eight hundred seventy-two".