71712220 has 12 divisors (see below), whose sum is σ = 150595704. Its totient is φ = 28684880.

The previous prime is 71712217. The next prime is 71712241. The reversal of 71712220 is 2221717.

It is a junction number, because it is equal to n+sod(n) for n = 71712191 and 71712200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1792786 + ... + 1792825.

It is an arithmetic number, because the mean of its divisors is an integer number (12549642).

Almost surely, 2^71712220 is an apocalyptic number.

It is an amenable number.

71712220 is an abundant number, since it is smaller than the sum of its proper divisors (78883484).

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

71712220 is a wasteful number, since it uses less digits than its factorization.

71712220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3585620 (or 3585618 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 71712220 is about 8468.3067965208. The cubic root of 71712220 is about 415.4617592117.

Adding to 71712220 its reverse (2221717), we get a palindrome (73933937).

The spelling of 71712220 in words is "seventy-one million, seven hundred twelve thousand, two hundred twenty".