71667855 has 64 divisors (see below), whose sum is σ = 146764800. Its totient is φ = 32503680.

The previous prime is 71667821. The next prime is 71667859. The reversal of 71667855 is 55876617.

It is not a de Polignac number, because 71667855 - 2⁷ = 71667727 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 71667855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71667859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 170836 + ... + 171254.

It is an arithmetic number, because the mean of its divisors is an integer number (2293200).

Almost surely, 2^71667855 is an apocalyptic number.

71667855 is an abundant number, since it is smaller than the sum of its proper divisors (75096945).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71667855 is a wasteful number, since it uses less digits than its factorization.

71667855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621 (or 615 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 71667855 is about 8465.6869183782. The cubic root of 71667855 is about 415.3760659446.

The spelling of 71667855 in words is "seventy-one million, six hundred sixty-seven thousand, eight hundred fifty-five".