81958838 has 8 divisors (see below), whose sum is σ = 132395088. Its totient is φ = 37827144.

The previous prime is 81958813. The next prime is 81958841. The reversal of 81958838 is 83885918.

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

It is a super-2 number, since 2×81958838² = 13434502252620488, which contains 22 as substring.

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, 1576106 + ... + 1576157.

It is an arithmetic number, because the mean of its divisors is an integer number (16549386).

Almost surely, 2^81958838 is an apocalyptic number.

81958838 is a deficient number, since it is larger than the sum of its proper divisors (50436250).

81958838 is a wasteful number, since it uses less digits than its factorization.

81958838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3152278.

The product of its digits is 552960, while the sum is 50.

The square root of 81958838 is about 9053.1120616062. The cubic root of 81958838 is about 434.3754422851.

The spelling of 81958838 in words is "eighty-one million, nine hundred fifty-eight thousand, eight hundred thirty-eight".