72720601 has 4 divisors (see below), whose sum is σ = 73912804. Its totient is φ = 71528400.

The previous prime is 72720587. The next prime is 72720607. The reversal of 72720601 is 10602727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10602727 = 2689 ⋅3943.

It can be written as a sum of positive squares in 2 ways, for example, as 24000201 + 48720400 = 4899^2 + 6980^2 .

It is a cyclic number.

It is not a de Polignac number, because 72720601 - 2¹¹ = 72718553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72720607) 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, 596010 + ... + 596131.

It is an arithmetic number, because the mean of its divisors is an integer number (18478201).

Almost surely, 2^72720601 is an apocalyptic number.

It is an amenable number.

72720601 is a deficient number, since it is larger than the sum of its proper divisors (1192203).

72720601 is a wasteful number, since it uses less digits than its factorization.

72720601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192202.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 72720601 is about 8527.6374805687. The cubic root of 72720601 is about 417.4000401325.

The spelling of 72720601 in words is "seventy-two million, seven hundred twenty thousand, six hundred one".