71720722 has 16 divisors (see below), whose sum is σ = 114124032. Its totient is φ = 33687360.

The previous prime is 71720717. The next prime is 71720723. The reversal of 71720722 is 22702717.

It is not an unprimeable number, because it can be changed into a prime (71720723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19783 + ... + 23125.

It is an arithmetic number, because the mean of its divisors is an integer number (7132752).

Almost surely, 2^71720722 is an apocalyptic number.

71720722 is a deficient number, since it is larger than the sum of its proper divisors (42403310).

71720722 is a wasteful number, since it uses less digits than its factorization.

71720722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3993.

The product of its (nonzero) digits is 2744, while the sum is 28.

The square root of 71720722 is about 8468.8087710138. The cubic root of 71720722 is about 415.4781772238.

The spelling of 71720722 in words is "seventy-one million, seven hundred twenty thousand, seven hundred twenty-two".