25780842 has 24 divisors (see below), whose sum is σ = 57928416. Its totient is φ = 8593452.

The previous prime is 25780831. The next prime is 25780847. The reversal of 25780842 is 24808752.

It is a happy number.

25780842 is a `hidden beast` number, since 2 + 578 + 0 + 84 + 2 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 25780797 and 25780806.

It is not an unprimeable number, because it can be changed into a prime (25780847) 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 11 ways as a sum of consecutive naturals, for example, 26038 + ... + 27009.

It is an arithmetic number, because the mean of its divisors is an integer number (2413684).

Almost surely, 2^25780842 is an apocalyptic number.

25780842 is an abundant number, since it is smaller than the sum of its proper divisors (32147574).

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

25780842 is an equidigital number, since it uses as much as digits as its factorization.

25780842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53064 (or 53052 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 25780842 is about 5077.4838256759. The cubic root of 25780842 is about 295.4148792422.

The spelling of 25780842 in words is "twenty-five million, seven hundred eighty thousand, eight hundred forty-two".