71229920 has 24 divisors (see below), whose sum is σ = 168281064. Its totient is φ = 28491904.

The previous prime is 71229901. The next prime is 71229923. The reversal of 71229920 is 2992217.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71229923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222434 + ... + 222753.

It is an arithmetic number, because the mean of its divisors is an integer number (7011711).

Almost surely, 2^71229920 is an apocalyptic number.

It is an amenable number.

71229920 is an abundant number, since it is smaller than the sum of its proper divisors (97051144).

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

71229920 is a wasteful number, since it uses less digits than its factorization.

71229920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445202 (or 445194 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 71229920 is about 8439.7819877056. The cubic root of 71229920 is about 414.5282683586.

The spelling of 71229920 in words is "seventy-one million, two hundred twenty-nine thousand, nine hundred twenty".