7123807728605 has 4 divisors (see below), whose sum is σ = 8548569274332. Its totient is φ = 5699046182880.

The previous prime is 7123807728577. The next prime is 7123807728617. The reversal of 7123807728605 is 5068277083217.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5388610110244 + 1735197618361 = 2321338^2 + 1317269^2 .

It is not a de Polignac number, because 7123807728605 - 2²⁸ = 7123539293149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 712380772856 + ... + 712380772865.

It is an arithmetic number, because the mean of its divisors is an integer number (2137142318583).

Almost surely, 2^{7123807728605} is an apocalyptic number.

It is an amenable number.

7123807728605 is a deficient number, since it is larger than the sum of its proper divisors (1424761545727).

7123807728605 is a wasteful number, since it uses less digits than its factorization.

7123807728605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424761545726.

The product of its (nonzero) digits is 7902720, while the sum is 56.

The spelling of 7123807728605 in words is "seven trillion, one hundred twenty-three billion, eight hundred seven million, seven hundred twenty-eight thousand, six hundred five".