72820843 has 8 divisors (see below), whose sum is σ = 77669712. Its totient is φ = 68034816.

The previous prime is 72820837. The next prime is 72820859. The reversal of 72820843 is 34802827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-72820843 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72820799 and 72820808.

It is not an unprimeable number, because it can be changed into a prime (72820043) 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 7 ways as a sum of consecutive naturals, for example, 13305 + ... + 17962.

It is an arithmetic number, because the mean of its divisors is an integer number (9708714).

Almost surely, 2^72820843 is an apocalyptic number.

72820843 is a deficient number, since it is larger than the sum of its proper divisors (4848869).

72820843 is a wasteful number, since it uses less digits than its factorization.

72820843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31421.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 72820843 is about 8533.5129343079. The cubic root of 72820843 is about 417.5917409878.

The spelling of 72820843 in words is "seventy-two million, eight hundred twenty thousand, eight hundred forty-three".