81830372940 has 72 divisors (see below), whose sum is σ = 248252292288. Its totient is φ = 21818488320.

The previous prime is 81830372893. The next prime is 81830372951. The reversal of 81830372940 is 4927303818.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1525780 + ... + 1578500.

It is an arithmetic number, because the mean of its divisors is an integer number (3447948504).

Almost surely, 2^81830372940 is an apocalyptic number.

It is an amenable number.

81830372940 is an abundant number, since it is smaller than the sum of its proper divisors (166421919348).

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

81830372940 is a wasteful number, since it uses less digits than its factorization.

81830372940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61359 (or 61354 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 81830372940 in words is "eighty-one billion, eight hundred thirty million, three hundred seventy-two thousand, nine hundred forty".