25770820 has 12 divisors (see below), whose sum is σ = 54118764. Its totient is φ = 10308320.

The previous prime is 25770781. The next prime is 25770839. The reversal of 25770820 is 2807752.

It can be written as a sum of positive squares in 2 ways, for example, as 12404484 + 13366336 = 3522^2 + 3656^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 644251 + ... + 644290.

It is an arithmetic number, because the mean of its divisors is an integer number (4509897).

Almost surely, 2^25770820 is an apocalyptic number.

25770820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25770820 is an abundant number, since it is smaller than the sum of its proper divisors (28347944).

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

25770820 is a wasteful number, since it uses less digits than its factorization.

25770820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288550 (or 1288548 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 25770820 is about 5076.4968235979. The cubic root of 25770820 is about 295.3765945908.

The spelling of 25770820 in words is "twenty-five million, seven hundred seventy thousand, eight hundred twenty".