72880729 has 4 divisors (see below), whose sum is σ = 72915876. Its totient is φ = 72845584.

The previous prime is 72880711. The next prime is 72880747. The reversal of 72880729 is 92708827.

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

It is an interprime number because it is at equal distance from previous prime (72880711) and next prime (72880747).

It can be written as a sum of positive squares in 2 ways, for example, as 41576704 + 31304025 = 6448^2 + 5595^2 .

It is a cyclic number.

It is not a de Polignac number, because 72880729 - 2⁹ = 72880217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72880529) 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, 14254 + ... + 18679.

It is an arithmetic number, because the mean of its divisors is an integer number (18228969).

Almost surely, 2^72880729 is an apocalyptic number.

It is an amenable number.

72880729 is a deficient number, since it is larger than the sum of its proper divisors (35147).

72880729 is a wasteful number, since it uses less digits than its factorization.

72880729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35146.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 72880729 is about 8537.0210846641. The cubic root of 72880729 is about 417.7061818805.

The spelling of 72880729 in words is "seventy-two million, eight hundred eighty thousand, seven hundred twenty-nine".