72855771 has 8 divisors (see below), whose sum is σ = 97305600. Its totient is φ = 48488232.

The previous prime is 72855767. The next prime is 72855779. The reversal of 72855771 is 17755827.

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

It is not a de Polignac number, because 72855771 - 2² = 72855767 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (72855779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18475 + ... + 22068.

It is an arithmetic number, because the mean of its divisors is an integer number (12163200).

Almost surely, 2^72855771 is an apocalyptic number.

72855771 is a deficient number, since it is larger than the sum of its proper divisors (24449829).

72855771 is a wasteful number, since it uses less digits than its factorization.

72855771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41145.

The product of its digits is 137200, while the sum is 42.

The square root of 72855771 is about 8535.5592083940. The cubic root of 72855771 is about 417.6584952868.

The spelling of 72855771 in words is "seventy-two million, eight hundred fifty-five thousand, seven hundred seventy-one".