71216670 has 32 divisors (see below), whose sum is σ = 195337728. Its totient is φ = 16278048.

The previous prime is 71216627. The next prime is 71216681. The reversal of 71216670 is 7661217.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169354 + ... + 169773.

It is an arithmetic number, because the mean of its divisors is an integer number (6104304).

Almost surely, 2^71216670 is an apocalyptic number.

71216670 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

71216670 is an abundant number, since it is smaller than the sum of its proper divisors (124121058).

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

71216670 is a wasteful number, since it uses less digits than its factorization.

71216670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339144.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 71216670 is about 8438.9969783144. The cubic root of 71216670 is about 414.5025636166.

Adding to 71216670 its reverse (7661217), we get a palindrome (78877887).

The spelling of 71216670 in words is "seventy-one million, two hundred sixteen thousand, six hundred seventy".