73920388385 has 4 divisors (see below), whose sum is σ = 88704466068. Its totient is φ = 59136310704.

The previous prime is 73920388369. The next prime is 73920388391. The reversal of 73920388385 is 58388302937.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58388302937 = 4751 ⋅12289687.

It can be written as a sum of positive squares in 2 ways, for example, as 15825891601 + 58094496784 = 125801^2 + 241028^2 .

It is a cyclic number.

It is not a de Polignac number, because 73920388385 - 2⁴ = 73920388369 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 73920388385.

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, 7392038834 + ... + 7392038843.

It is an arithmetic number, because the mean of its divisors is an integer number (22176116517).

Almost surely, 2^73920388385 is an apocalyptic number.

It is an amenable number.

73920388385 is a deficient number, since it is larger than the sum of its proper divisors (14784077683).

73920388385 is a wasteful number, since it uses less digits than its factorization.

73920388385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14784077682.

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 73920388385 in words is "seventy-three billion, nine hundred twenty million, three hundred eighty-eight thousand, three hundred eighty-five".