81000350684 has 24 divisors (see below), whose sum is σ = 154645119216. Its totient is φ = 36816416000.

The previous prime is 81000350681. The next prime is 81000350701. The reversal of 81000350684 is 48605300018.

It is a super-2 number, since 2×81000350684² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81000350681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1123154 + ... + 1193094.

It is an arithmetic number, because the mean of its divisors is an integer number (6443546634).

Almost surely, 2^81000350684 is an apocalyptic number.

It is an amenable number.

81000350684 is a deficient number, since it is larger than the sum of its proper divisors (73644768532).

81000350684 is a wasteful number, since it uses less digits than its factorization.

81000350684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96277 (or 96275 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 81000350684 in words is "eighty-one billion, three hundred fifty thousand, six hundred eighty-four".