81958754 has 16 divisors (see below), whose sum is σ = 126252000. Its totient is φ = 39879840.

The previous prime is 81958753. The next prime is 81958777. The reversal of 81958754 is 45785918.

It is a junction number, because it is equal to n+sod(n) for n = 81958699 and 81958708.

It is not an unprimeable number, because it can be changed into a prime (81958753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39917 + ... + 41919.

It is an arithmetic number, because the mean of its divisors is an integer number (7890750).

Almost surely, 2^81958754 is an apocalyptic number.

81958754 is a deficient number, since it is larger than the sum of its proper divisors (44293246).

81958754 is a wasteful number, since it uses less digits than its factorization.

81958754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2545.

The product of its digits is 403200, while the sum is 47.

The square root of 81958754 is about 9053.1074223164. The cubic root of 81958754 is about 434.3752938873.

The spelling of 81958754 in words is "eighty-one million, nine hundred fifty-eight thousand, seven hundred fifty-four".