71533820 has 12 divisors (see below), whose sum is σ = 150221064. Its totient is φ = 28613520.

The previous prime is 71533801. The next prime is 71533883. The reversal of 71533820 is 2833517.

It is a congruent number.

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, 1788326 + ... + 1788365.

It is an arithmetic number, because the mean of its divisors is an integer number (12518422).

Almost surely, 2^71533820 is an apocalyptic number.

It is an amenable number.

71533820 is an abundant number, since it is smaller than the sum of its proper divisors (78687244).

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

71533820 is a wasteful number, since it uses less digits than its factorization.

71533820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3576700 (or 3576698 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 71533820 is about 8457.7668447410. The cubic root of 71533820 is about 415.1169554721.

The spelling of 71533820 in words is "seventy-one million, five hundred thirty-three thousand, eight hundred twenty".