71720022 has 32 divisors (see below), whose sum is σ = 164718720. Its totient is φ = 20589120.

The previous prime is 71719993. The next prime is 71720039. The reversal of 71720022 is 22002717.

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, 27343 + ... + 29850.

It is an arithmetic number, because the mean of its divisors is an integer number (5147460).

Almost surely, 2^71720022 is an apocalyptic number.

71720022 is an abundant number, since it is smaller than the sum of its proper divisors (92998698).

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

71720022 is a wasteful number, since it uses less digits than its factorization.

71720022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57228.

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 71720022 is about 8468.7674427865. The cubic root of 71720022 is about 415.4768255193.

Adding to 71720022 its reverse (22002717), we get a palindrome (93722739).

The spelling of 71720022 in words is "seventy-one million, seven hundred twenty thousand, twenty-two".