81182738 has 32 divisors (see below), whose sum is σ = 154721280. Its totient is φ = 31078080.

The previous prime is 81182723. The next prime is 81182767. The reversal of 81182738 is 83728118.

It is a Cunningham number, because it is equal to 433³+1.

It is a Curzon 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, 1553 + ... + 12836.

It is an arithmetic number, because the mean of its divisors is an integer number (4835040).

Almost surely, 2^81182738 is an apocalyptic number.

81182738 is a deficient number, since it is larger than the sum of its proper divisors (73538542).

81182738 is a wasteful number, since it uses less digits than its factorization.

81182738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14442.

The product of its digits is 21504, while the sum is 38.

The square root of 81182738 is about 9010.1463917075. The cubic root of 81182738 is about 433.0000017779. Note that the first 5 decimals are identical.

The spelling of 81182738 in words is "eighty-one million, one hundred eighty-two thousand, seven hundred thirty-eight".