72707123 has 4 divisors (see below), whose sum is σ = 72729048. Its totient is φ = 72685200.

The previous prime is 72707111. The next prime is 72707189. The reversal of 72707123 is 32170727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32170727 = 107 ⋅300661.

It is a cyclic number.

It is not a de Polignac number, because 72707123 - 2¹⁰ = 72706099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72707423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4853 + ... + 12998.

It is an arithmetic number, because the mean of its divisors is an integer number (18182262).

Almost surely, 2^72707123 is an apocalyptic number.

72707123 is a deficient number, since it is larger than the sum of its proper divisors (21925).

72707123 is a wasteful number, since it uses less digits than its factorization.

72707123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21924.

The product of its (nonzero) digits is 4116, while the sum is 29.

The square root of 72707123 is about 8526.8471899055. The cubic root of 72707123 is about 417.3742516340.

The spelling of 72707123 in words is "seventy-two million, seven hundred seven thousand, one hundred twenty-three".