81837173028 has 48 divisors (see below), whose sum is σ = 207022334400. Its totient is φ = 25011663744.

The previous prime is 81837172999. The next prime is 81837173029. The reversal of 81837173028 is 82037173818.

It is not an unprimeable number, because it can be changed into a prime (81837173029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1737150 + ... + 1783637.

It is an arithmetic number, because the mean of its divisors is an integer number (4312965300).

Almost surely, 2^81837173028 is an apocalyptic number.

It is an amenable number.

81837173028 is an abundant number, since it is smaller than the sum of its proper divisors (125185161372).

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

81837173028 is a wasteful number, since it uses less digits than its factorization.

81837173028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3520956 (or 3520954 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 48.

The spelling of 81837173028 in words is "eighty-one billion, eight hundred thirty-seven million, one hundred seventy-three thousand, twenty-eight".