81958038 has 16 divisors (see below), whose sum is σ = 164127936. Its totient is φ = 27284040.

The previous prime is 81958013. The next prime is 81958099. The reversal of 81958038 is 83085918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3556 + ... + 13287.

It is an arithmetic number, because the mean of its divisors is an integer number (10257996).

Almost surely, 2^81958038 is an apocalyptic number.

81958038 is an abundant number, since it is smaller than the sum of its proper divisors (82169898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81958038 is a wasteful number, since it uses less digits than its factorization.

81958038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17659.

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 81958038 is about 9053.0678777970. The cubic root of 81958038 is about 434.3740289680.

The spelling of 81958038 in words is "eighty-one million, nine hundred fifty-eight thousand, thirty-eight".