81825862 has 8 divisors (see below), whose sum is σ = 129958776. Its totient is φ = 38506272.

The previous prime is 81825859. The next prime is 81825869. The reversal of 81825862 is 26852818.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81825869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1203288 + ... + 1203355.

It is an arithmetic number, because the mean of its divisors is an integer number (16244847).

Almost surely, 2^81825862 is an apocalyptic number.

81825862 is a deficient number, since it is larger than the sum of its proper divisors (48132914).

81825862 is a wasteful number, since it uses less digits than its factorization.

81825862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2406662.

The product of its digits is 61440, while the sum is 40.

The square root of 81825862 is about 9045.7648653942. The cubic root of 81825862 is about 434.1403943137.

The spelling of 81825862 in words is "eighty-one million, eight hundred twenty-five thousand, eight hundred sixty-two".