81673486 has 8 divisors (see below), whose sum is σ = 122570784. Its totient is φ = 40816560.

The previous prime is 81673463. The next prime is 81673489. The reversal of 81673486 is 68437618.

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 (81673489) 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, 4390 + ... + 13513.

It is an arithmetic number, because the mean of its divisors is an integer number (15321348).

Almost surely, 2^81673486 is an apocalyptic number.

81673486 is a deficient number, since it is larger than the sum of its proper divisors (40897298).

81673486 is a wasteful number, since it uses less digits than its factorization.

81673486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20186.

The product of its digits is 193536, while the sum is 43.

The square root of 81673486 is about 9037.3384356236. The cubic root of 81673486 is about 433.8707416607.

The spelling of 81673486 in words is "eighty-one million, six hundred seventy-three thousand, four hundred eighty-six".