71172420 has 48 divisors (see below), whose sum is σ = 217401408. Its totient is φ = 17253760.

The previous prime is 71172403. The next prime is 71172463. The reversal of 71172420 is 2427117.

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, 53259 + ... + 54578.

It is an arithmetic number, because the mean of its divisors is an integer number (4529196).

Almost surely, 2^71172420 is an apocalyptic number.

It is an amenable number.

71172420 is an abundant number, since it is smaller than the sum of its proper divisors (146228988).

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

71172420 is a wasteful number, since it uses less digits than its factorization.

71172420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107860 (or 107858 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 71172420 is about 8436.3748138641. The cubic root of 71172420 is about 414.4166963677.

Adding to 71172420 its reverse (2427117), we get a palindrome (73599537).

The spelling of 71172420 in words is "seventy-one million, one hundred seventy-two thousand, four hundred twenty".