81437846072 has 16 divisors (see below), whose sum is σ = 166577412600. Its totient is φ = 37017202720.

The previous prime is 81437846059. The next prime is 81437846093. The reversal of 81437846072 is 27064873418.

It is a self number, because there is not a number n which added to its sum of digits gives 81437846072.

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, 462714947 + ... + 462715122.

Almost surely, 2^81437846072 is an apocalyptic number.

It is an amenable number.

81437846072 is an abundant number, since it is smaller than the sum of its proper divisors (85139566528).

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

81437846072 is a wasteful number, since it uses less digits than its factorization.

81437846072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925430086 (or 925430082 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 50.

The spelling of 81437846072 in words is "eighty-one billion, four hundred thirty-seven million, eight hundred forty-six thousand, seventy-two".