73181998 has 8 divisors (see below), whose sum is σ = 114545808. Its totient is φ = 35000064.

The previous prime is 73181963. The next prime is 73182047. The reversal of 73181998 is 89918137.

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

It is a Harshad number since it is a multiple of its sum of digits (46), and also a Moran number because the ratio is a prime number: 1590913 = 73181998 / (7 + 3 + 1 + 8 + 1 + 9 + 9 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 795411 + ... + 795502.

It is an arithmetic number, because the mean of its divisors is an integer number (14318226).

Almost surely, 2^73181998 is an apocalyptic number.

73181998 is a deficient number, since it is larger than the sum of its proper divisors (41363810).

73181998 is a wasteful number, since it uses less digits than its factorization.

73181998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590938.

The product of its digits is 108864, while the sum is 46.

The square root of 73181998 is about 8554.6477426017. The cubic root of 73181998 is about 418.2809516624.

It can be divided in two parts, 7318 and 1998, that added together give a triangular number (9316 = T₁₃₆).

The spelling of 73181998 in words is "seventy-three million, one hundred eighty-one thousand, nine hundred ninety-eight".