81180838 has 8 divisors (see below), whose sum is σ = 121811400. Its totient is φ = 40577040.

The previous prime is 81180833. The next prime is 81180851. The reversal of 81180838 is 83808118.

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

It is a junction number, because it is equal to n+sod(n) for n = 81180797 and 81180806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81180833) 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, 4933 + ... + 13663.

It is an arithmetic number, because the mean of its divisors is an integer number (15226425).

Almost surely, 2^81180838 is an apocalyptic number.

81180838 is a deficient number, since it is larger than the sum of its proper divisors (40630562).

81180838 is a wasteful number, since it uses less digits than its factorization.

81180838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13382.

The product of its (nonzero) digits is 12288, while the sum is 37.

The square root of 81180838 is about 9010.0409544019. The cubic root of 81180838 is about 432.9966237756.

The spelling of 81180838 in words is "eighty-one million, one hundred eighty thousand, eight hundred thirty-eight".