81728146094 has 16 divisors (see below), whose sum is σ = 140269663968. Its totient is φ = 34985280672.

The previous prime is 81728146091. The next prime is 81728146099. The reversal of 81728146094 is 49064182718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81728146091) 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, 3409937 + ... + 3433820.

It is an arithmetic number, because the mean of its divisors is an integer number (8766853998).

Almost surely, 2^81728146094 is an apocalyptic number.

81728146094 is a deficient number, since it is larger than the sum of its proper divisors (58541517874).

81728146094 is a wasteful number, since it uses less digits than its factorization.

81728146094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6844619.

The product of its (nonzero) digits is 774144, while the sum is 50.

The spelling of 81728146094 in words is "eighty-one billion, seven hundred twenty-eight million, one hundred forty-six thousand, ninety-four".