25982820 has 36 divisors (see below), whose sum is σ = 78815100. Its totient is φ = 6928704.

The previous prime is 25982819. The next prime is 25982821. The reversal of 25982820 is 2828952.

It is an interprime number because it is at equal distance from previous prime (25982819) and next prime (25982821).

It can be written as a sum of positive squares in 2 ways, for example, as 12278016 + 13704804 = 3504^2 + 3702^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (25982821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71995 + ... + 72354.

Almost surely, 2^25982820 is an apocalyptic number.

25982820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25982820 is an abundant number, since it is smaller than the sum of its proper divisors (52832280).

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

25982820 is a wasteful number, since it uses less digits than its factorization.

25982820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144364 (or 144359 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 25982820 is about 5097.3345976108. The cubic root of 25982820 is about 296.1843415886.

The spelling of 25982820 in words is "twenty-five million, nine hundred eighty-two thousand, eight hundred twenty".