72855807 has 4 divisors (see below), whose sum is σ = 97141080. Its totient is φ = 48570536.

The previous prime is 72855791. The next prime is 72855817. The reversal of 72855807 is 70855827.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72855807 - 2⁴ = 72855791 is a prime.

It is a super-2 number, since 2×72855807² = 10615937227242498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72855817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12142632 + ... + 12142637.

It is an arithmetic number, because the mean of its divisors is an integer number (24285270).

Almost surely, 2^72855807 is an apocalyptic number.

72855807 is a deficient number, since it is larger than the sum of its proper divisors (24285273).

72855807 is a wasteful number, since it uses less digits than its factorization.

72855807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24285272.

The product of its (nonzero) digits is 156800, while the sum is 42.

The square root of 72855807 is about 8535.5613172187. The cubic root of 72855807 is about 417.6585640789.

The spelling of 72855807 in words is "seventy-two million, eight hundred fifty-five thousand, eight hundred seven".