71216618 has 16 divisors (see below), whose sum is σ = 116666784. Its totient is φ = 32334960.

The previous prime is 71216603. The next prime is 71216623. The reversal of 71216618 is 81661217.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34121 + ... + 36147.

It is an arithmetic number, because the mean of its divisors is an integer number (7291674).

Almost surely, 2^71216618 is an apocalyptic number.

71216618 is a deficient number, since it is larger than the sum of its proper divisors (45450166).

71216618 is a wasteful number, since it uses less digits than its factorization.

71216618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3637.

The product of its digits is 4032, while the sum is 32.

The square root of 71216618 is about 8438.9938973790. The cubic root of 71216618 is about 414.5024627313.

The spelling of 71216618 in words is "seventy-one million, two hundred sixteen thousand, six hundred eighteen".