180428039905 has 16 divisors (see below), whose sum is σ = 220272056784. Its totient is φ = 141851105280.

The previous prime is 180428039789. The next prime is 180428039969. The reversal of 180428039905 is 509930824081.

It can be written as a sum of positive squares in 8 ways, for example, as 5195382241 + 175232657664 = 72079^2 + 418608^2 .

It is not a de Polignac number, because 180428039905 - 2²⁵ = 180394485473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 791176 + ... + 993385.

It is an arithmetic number, because the mean of its divisors is an integer number (13767003549).

Almost surely, 2^180428039905 is an apocalyptic number.

It is an amenable number.

180428039905 is a deficient number, since it is larger than the sum of its proper divisors (39844016879).

180428039905 is a wasteful number, since it uses less digits than its factorization.

180428039905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784916.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 180428039905 in words is "one hundred eighty billion, four hundred twenty-eight million, thirty-nine thousand, nine hundred five".