72919729 has 4 divisors (see below), whose sum is σ = 76090176. Its totient is φ = 69749284.

The previous prime is 72919703. The next prime is 72919741. The reversal of 72919729 is 92791927.

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.

It is a cyclic number.

It is not a de Polignac number, because 72919729 - 2¹¹ = 72917681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72919829) 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, 1585189 + ... + 1585234.

It is an arithmetic number, because the mean of its divisors is an integer number (19022544).

Almost surely, 2^72919729 is an apocalyptic number.

It is an amenable number.

72919729 is a deficient number, since it is larger than the sum of its proper divisors (3170447).

72919729 is a wasteful number, since it uses less digits than its factorization.

72919729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3170446.

The product of its digits is 142884, while the sum is 46.

The square root of 72919729 is about 8539.3049482964. The cubic root of 72919729 is about 417.7806763611.

It can be divided in two parts, 7291 and 9729, that added together give a triangular number (17020 = T₁₈₄).

The spelling of 72919729 in words is "seventy-two million, nine hundred nineteen thousand, seven hundred twenty-nine".