71220424 has 16 divisors (see below), whose sum is σ = 145678320. Its totient is φ = 32372880.

The previous prime is 71220421. The next prime is 71220431. The reversal of 71220424 is 42402217.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 71220395 and 71220404.

It is not an unprimeable number, because it can be changed into a prime (71220421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404574 + ... + 404749.

It is an arithmetic number, because the mean of its divisors is an integer number (9104895).

Almost surely, 2^71220424 is an apocalyptic number.

It is an amenable number.

71220424 is an abundant number, since it is smaller than the sum of its proper divisors (74457896).

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

71220424 is a wasteful number, since it uses less digits than its factorization.

71220424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809340 (or 809336 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 71220424 is about 8439.2193951810. The cubic root of 71220424 is about 414.5098466272.

The spelling of 71220424 in words is "seventy-one million, two hundred twenty thousand, four hundred twenty-four".