83123989728 has 48 divisors (see below), whose sum is σ = 234985128336. Its totient is φ = 25576611840.

The previous prime is 83123989693. The next prime is 83123989747. The reversal of 83123989728 is 82798932138.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33301633 + ... + 33304128.

It is an arithmetic number, because the mean of its divisors is an integer number (4895523507).

Almost surely, 2^83123989728 is an apocalyptic number.

It is an amenable number.

83123989728 is an abundant number, since it is smaller than the sum of its proper divisors (151861138608).

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

83123989728 is a wasteful number, since it uses less digits than its factorization.

83123989728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66605787 (or 66605779 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 60.

The spelling of 83123989728 in words is "eighty-three billion, one hundred twenty-three million, nine hundred eighty-nine thousand, seven hundred twenty-eight".