71030920 has 32 divisors (see below), whose sum is σ = 164977920. Its totient is φ = 27495360.

The previous prime is 71030917. The next prime is 71030929. The reversal of 71030920 is 2903017.

It is a junction number, because it is equal to n+sod(n) for n = 71030891 and 71030900.

It is not an unprimeable number, because it can be changed into a prime (71030929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27402 + ... + 29881.

It is an arithmetic number, because the mean of its divisors is an integer number (5155560).

Almost surely, 2^71030920 is an apocalyptic number.

It is an amenable number.

71030920 is an abundant number, since it is smaller than the sum of its proper divisors (93947000).

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

71030920 is a wasteful number, since it uses less digits than its factorization.

71030920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57325 (or 57321 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 71030920 is about 8427.9843379067. The cubic root of 71030920 is about 414.1418761176.

Adding to 71030920 its reverse (2903017), we get a palindrome (73933937).

The spelling of 71030920 in words is "seventy-one million, thirty thousand, nine hundred twenty".