71820464 has 20 divisors (see below), whose sum is σ = 141512520. Its totient is φ = 35301120.

The previous prime is 71820457. The next prime is 71820473. The reversal of 71820464 is 46402817.

It is a self number, because there is not a number n which added to its sum of digits gives 71820464.

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, 37097 + ... + 38984.

It is an arithmetic number, because the mean of its divisors is an integer number (7075626).

Almost surely, 2^71820464 is an apocalyptic number.

It is an amenable number.

71820464 is a deficient number, since it is larger than the sum of its proper divisors (69692056).

71820464 is a wasteful number, since it uses less digits than its factorization.

71820464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76148 (or 76142 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 71820464 is about 8474.6955107544. The cubic root of 71820464 is about 415.6706898270.

The spelling of 71820464 in words is "seventy-one million, eight hundred twenty thousand, four hundred sixty-four".