72704729 has 4 divisors (see below), whose sum is σ = 72787584. Its totient is φ = 72621876.

The previous prime is 72704719. The next prime is 72704743. The reversal of 72704729 is 92740727.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92740727 = 151 ⋅614177.

It is a cyclic number.

It is not a de Polignac number, because 72704729 - 2⁸ = 72704473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72704692 and 72704701.

It is not an unprimeable number, because it can be changed into a prime (72704719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40097 + ... + 41870.

It is an arithmetic number, because the mean of its divisors is an integer number (18196896).

Almost surely, 2^72704729 is an apocalyptic number.

It is an amenable number.

72704729 is a deficient number, since it is larger than the sum of its proper divisors (82855).

72704729 is an equidigital number, since it uses as much as digits as its factorization.

72704729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82854.

The product of its (nonzero) digits is 49392, while the sum is 38.

The square root of 72704729 is about 8526.7068086102. The cubic root of 72704729 is about 417.3696706756.

The spelling of 72704729 in words is "seventy-two million, seven hundred four thousand, seven hundred twenty-nine".