81854036 has 48 divisors (see below), whose sum is σ = 160187328. Its totient is φ = 36288000.

The previous prime is 81853973. The next prime is 81854041. The reversal of 81854036 is 63045818.

It is a junction number, because it is equal to n+sod(n) for n = 81853987 and 81854005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 502091 + ... + 502253.

It is an arithmetic number, because the mean of its divisors is an integer number (3337236).

Almost surely, 2^81854036 is an apocalyptic number.

It is an amenable number.

81854036 is a deficient number, since it is larger than the sum of its proper divisors (78333292).

81854036 is a wasteful number, since it uses less digits than its factorization.

81854036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 81854036 is about 9047.3220347239. The cubic root of 81854036 is about 434.1902158396.

It can be divided in two parts, 8185 and 4036, that added together give a palindrome (12221).

The spelling of 81854036 in words is "eighty-one million, eight hundred fifty-four thousand, thirty-six".