673638728305 has 32 divisors (see below), whose sum is σ = 835184299680. Its totient is φ = 521322946560.

The previous prime is 673638728293. The next prime is 673638728311. The reversal of 673638728305 is 503827836376.

It can be written as a sum of positive squares in 16 ways, for example, as 40912343824 + 632726384481 = 202268^2 + 795441^2 .

It is not a de Polignac number, because 673638728305 - 2²⁵ = 673605173873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 673638728305.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110050645 + ... + 110056765.

It is an arithmetic number, because the mean of its divisors is an integer number (26099509365).

Almost surely, 2^673638728305 is an apocalyptic number.

It is an amenable number.

673638728305 is a deficient number, since it is larger than the sum of its proper divisors (161545571375).

673638728305 is a wasteful number, since it uses less digits than its factorization.

673638728305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11941.

The product of its (nonzero) digits is 30481920, while the sum is 58.

The spelling of 673638728305 in words is "six hundred seventy-three billion, six hundred thirty-eight million, seven hundred twenty-eight thousand, three hundred five".