72723945 has 32 divisors (see below), whose sum is σ = 133309440. Its totient is φ = 33163200.

The previous prime is 72723901. The next prime is 72723949. The reversal of 72723945 is 54932727.

It is not a de Polignac number, because 72723945 - 2⁷ = 72723817 is a prime.

It is a super-4 number, since 4×72723945⁴ (a number of 33 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (72723949) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68670 + ... + 69720.

It is an arithmetic number, because the mean of its divisors is an integer number (4165920).

Almost surely, 2^72723945 is an apocalyptic number.

It is an amenable number.

72723945 is a deficient number, since it is larger than the sum of its proper divisors (60585495).

72723945 is a wasteful number, since it uses less digits than its factorization.

72723945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725.

The product of its digits is 105840, while the sum is 39.

The square root of 72723945 is about 8527.8335466870. The cubic root of 72723945 is about 417.4064379727.

The spelling of 72723945 in words is "seventy-two million, seven hundred twenty-three thousand, nine hundred forty-five".