72723158 has 4 divisors (see below), whose sum is σ = 109084740. Its totient is φ = 36361578.

The previous prime is 72723151. The next prime is 72723173. The reversal of 72723158 is 85132727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85132727 = 31 ⋅2746217.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72723151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18180788 + ... + 18180791.

It is an arithmetic number, because the mean of its divisors is an integer number (27271185).

Almost surely, 2^72723158 is an apocalyptic number.

72723158 is a deficient number, since it is larger than the sum of its proper divisors (36361582).

72723158 is a wasteful number, since it uses less digits than its factorization.

72723158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36361581.

The product of its digits is 23520, while the sum is 35.

The square root of 72723158 is about 8527.7874035414. The cubic root of 72723158 is about 417.4049322785.

The spelling of 72723158 in words is "seventy-two million, seven hundred twenty-three thousand, one hundred fifty-eight".