81582838 has 8 divisors (see below), whose sum is σ = 122882760. Its totient is φ = 40621920.

The previous prime is 81582833. The next prime is 81582857. The reversal of 81582838 is 83828518.

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

It is a super-2 number, since 2×81582838² = 13311518912268488, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81582794 and 81582803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81582833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84148 + ... + 85111.

It is an arithmetic number, because the mean of its divisors is an integer number (15360345).

Almost surely, 2^81582838 is an apocalyptic number.

81582838 is a deficient number, since it is larger than the sum of its proper divisors (41299922).

81582838 is a wasteful number, since it uses less digits than its factorization.

81582838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169502.

The product of its digits is 122880, while the sum is 43.

The square root of 81582838 is about 9032.3218498900. The cubic root of 81582838 is about 433.7101670104.

The spelling of 81582838 in words is "eighty-one million, five hundred eighty-two thousand, eight hundred thirty-eight".