73818 has 16 divisors (see below), whose sum is σ = 164160. Its totient is φ = 24588.

The previous prime is 73783. The next prime is 73819. The reversal of 73818 is 81837.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 73791 and 73800.

It is not an unprimeable number, because it can be changed into a prime (73819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 630 + ... + 737.

It is an arithmetic number, because the mean of its divisors is an integer number (10260).

2⁷³⁸¹⁸ is an apocalyptic number.

73818 is an abundant number, since it is smaller than the sum of its proper divisors (90342).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82080).

73818 is a wasteful number, since it uses less digits than its factorization.

73818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378 (or 1372 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 73818 is about 271.6946815821. The cubic root of 73818 is about 41.9489174879.

The spelling of 73818 in words is "seventy-three thousand, eight hundred eighteen".