72708073 has 4 divisors (see below), whose sum is σ = 73704148. Its totient is φ = 71712000.

The previous prime is 72708067. The next prime is 72708089. The reversal of 72708073 is 37080727.

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 22963264 + 49744809 = 4792^2 + 7053^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72708073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72708043) 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, 497928 + ... + 498073.

It is an arithmetic number, because the mean of its divisors is an integer number (18426037).

Almost surely, 2^72708073 is an apocalyptic number.

72708073 is a gapful number since it is divisible by the number (73) formed by its first and last digit.

It is an amenable number.

72708073 is a deficient number, since it is larger than the sum of its proper divisors (996075).

72708073 is an equidigital number, since it uses as much as digits as its factorization.

72708073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996074.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 72708073 is about 8526.9028961282. The cubic root of 72708073 is about 417.3760694468.

The spelling of 72708073 in words is "seventy-two million, seven hundred eight thousand, seventy-three".