72845729 has 4 divisors (see below), whose sum is σ = 79468080. Its totient is φ = 66223380.

The previous prime is 72845719. The next prime is 72845743. The reversal of 72845729 is 92754827.

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 72845729 - 2⁴ = 72845713 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 72845729.

It is not an unprimeable number, because it can be changed into a prime (72845719) 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, 3311159 + ... + 3311180.

It is an arithmetic number, because the mean of its divisors is an integer number (19867020).

Almost surely, 2^72845729 is an apocalyptic number.

It is an amenable number.

72845729 is a deficient number, since it is larger than the sum of its proper divisors (6622351).

72845729 is a wasteful number, since it uses less digits than its factorization.

72845729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6622350.

The product of its digits is 282240, while the sum is 44.

The square root of 72845729 is about 8534.9709431257. The cubic root of 72845729 is about 417.6393052293.

The spelling of 72845729 in words is "seventy-two million, eight hundred forty-five thousand, seven hundred twenty-nine".