72158673 has 4 divisors (see below), whose sum is σ = 96211568. Its totient is φ = 48105780.

The previous prime is 72158663. The next prime is 72158689. The reversal of 72158673 is 37685127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37685127 = 3 ⋅12561709.

It is not a de Polignac number, because 72158673 - 2⁴ = 72158657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72158663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12026443 + ... + 12026448.

It is an arithmetic number, because the mean of its divisors is an integer number (24052892).

Almost surely, 2^72158673 is an apocalyptic number.

It is an amenable number.

72158673 is a deficient number, since it is larger than the sum of its proper divisors (24052895).

72158673 is a wasteful number, since it uses less digits than its factorization.

72158673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24052894.

The product of its digits is 70560, while the sum is 39.

The square root of 72158673 is about 8494.6261247921. The cubic root of 72158673 is about 416.3221451481.

The spelling of 72158673 in words is "seventy-two million, one hundred fifty-eight thousand, six hundred seventy-three".