71105420 has 48 divisors (see below), whose sum is σ = 156619008. Its totient is φ = 27065280.

The previous prime is 71105417. The next prime is 71105449. The reversal of 71105420 is 2450117.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 71105392 and 71105401.

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, 152027 + ... + 152493.

It is an arithmetic number, because the mean of its divisors is an integer number (3262896).

Almost surely, 2^71105420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71105420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78309504).

71105420 is an abundant number, since it is smaller than the sum of its proper divisors (85513588).

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

71105420 is a wasteful number, since it uses less digits than its factorization.

71105420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830 (or 828 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 71105420 is about 8432.4029789853. The cubic root of 71105420 is about 414.2866149123.

Adding to 71105420 its reverse (2450117), we get a palindrome (73555537).

The spelling of 71105420 in words is "seventy-one million, one hundred five thousand, four hundred twenty".