71320018 has 32 divisors (see below), whose sum is σ = 134304768. Its totient is φ = 27594000.

The previous prime is 71320013. The next prime is 71320043. The reversal of 71320018 is 81002317.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (71320013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21721 + ... + 24787.

It is an arithmetic number, because the mean of its divisors is an integer number (4197024).

Almost surely, 2^71320018 is an apocalyptic number.

71320018 is a deficient number, since it is larger than the sum of its proper divisors (62984750).

71320018 is a wasteful number, since it uses less digits than its factorization.

71320018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 71320018 is about 8445.1179979915. The cubic root of 71320018 is about 414.7029722465.

The spelling of 71320018 in words is "seventy-one million, three hundred twenty thousand, eighteen".