71820956 has 6 divisors (see below), whose sum is σ = 125686680. Its totient is φ = 35910476.

The previous prime is 71820923. The next prime is 71820961. The reversal of 71820956 is 65902817.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8977616 + ... + 8977623.

It is an arithmetic number, because the mean of its divisors is an integer number (20947780).

Almost surely, 2^71820956 is an apocalyptic number.

It is an amenable number.

71820956 is a deficient number, since it is larger than the sum of its proper divisors (53865724).

71820956 is a wasteful number, since it uses less digits than its factorization.

71820956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17955243 (or 17955241 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 71820956 is about 8474.7245382962. The cubic root of 71820956 is about 415.6716389971.

The spelling of 71820956 in words is "seventy-one million, eight hundred twenty thousand, nine hundred fifty-six".