81830287672 has 16 divisors (see below), whose sum is σ = 175350616560. Its totient is φ = 35070123264.

The previous prime is 81830287657. The next prime is 81830287709. The reversal of 81830287672 is 27678203818.

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, 730627513 + ... + 730627624.

It is an arithmetic number, because the mean of its divisors is an integer number (10959413535).

Almost surely, 2^81830287672 is an apocalyptic number.

It is an amenable number.

81830287672 is an abundant number, since it is smaller than the sum of its proper divisors (93520328888).

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

81830287672 is a wasteful number, since it uses less digits than its factorization.

81830287672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461255150 (or 1461255146 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 52.

The spelling of 81830287672 in words is "eighty-one billion, eight hundred thirty million, two hundred eighty-seven thousand, six hundred seventy-two".