72720293 has 4 divisors (see below), whose sum is σ = 74092428. Its totient is φ = 71348160.

The previous prime is 72720287. The next prime is 72720311. The reversal of 72720293 is 39202727.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46689889 + 26030404 = 6833^2 + 5102^2 .

It is a cyclic number.

It is not a de Polignac number, because 72720293 - 2¹⁴ = 72703909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72720283) 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, 685988 + ... + 686093.

It is an arithmetic number, because the mean of its divisors is an integer number (18523107).

Almost surely, 2^72720293 is an apocalyptic number.

It is an amenable number.

72720293 is a deficient number, since it is larger than the sum of its proper divisors (1372135).

72720293 is a wasteful number, since it uses less digits than its factorization.

72720293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372134.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 72720293 is about 8527.6194216205. The cubic root of 72720293 is about 417.3994508479.

The spelling of 72720293 in words is "seventy-two million, seven hundred twenty thousand, two hundred ninety-three".