71323820 has 12 divisors (see below), whose sum is σ = 149780064. Its totient is φ = 28529520.

The previous prime is 71323757. The next prime is 71323841. The reversal of 71323820 is 2832317.

It is a self number, because there is not a number n which added to its sum of digits gives 71323820.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1783076 + ... + 1783115.

It is an arithmetic number, because the mean of its divisors is an integer number (12481672).

Almost surely, 2^71323820 is an apocalyptic number.

It is an amenable number.

71323820 is an abundant number, since it is smaller than the sum of its proper divisors (78456244).

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

71323820 is a wasteful number, since it uses less digits than its factorization.

71323820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3566200 (or 3566198 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 71323820 is about 8445.3430954580. The cubic root of 71323820 is about 414.7103412514.

The spelling of 71323820 in words is "seventy-one million, three hundred twenty-three thousand, eight hundred twenty".