72202729 has 4 divisors (see below), whose sum is σ = 72396676. Its totient is φ = 72008784.

The previous prime is 72202709. The next prime is 72202783. The reversal of 72202729 is 92720227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92720227 = 17 ⋅5454131.

It can be written as a sum of positive squares in 2 ways, for example, as 52533504 + 19669225 = 7248^2 + 4435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72202729 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72202729.

It is not an unprimeable number, because it can be changed into a prime (72202709) 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, 96414 + ... + 97159.

It is an arithmetic number, because the mean of its divisors is an integer number (18099169).

Almost surely, 2^72202729 is an apocalyptic number.

It is an amenable number.

72202729 is a deficient number, since it is larger than the sum of its proper divisors (193947).

72202729 is a wasteful number, since it uses less digits than its factorization.

72202729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193946.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 72202729 is about 8497.2188979689. The cubic root of 72202729 is about 416.4068554870.

The spelling of 72202729 in words is "seventy-two million, two hundred two thousand, seven hundred twenty-nine".