71528805 has 32 divisors (see below), whose sum is σ = 130273920. Its totient is φ = 37215360.

The previous prime is 71528797. The next prime is 71528833. The reversal of 71528805 is 50882517.

It is not a de Polignac number, because 71528805 - 2³ = 71528797 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 71528805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 927 + ... + 11996.

It is an arithmetic number, because the mean of its divisors is an integer number (4071060).

Almost surely, 2^71528805 is an apocalyptic number.

It is an amenable number.

71528805 is a deficient number, since it is larger than the sum of its proper divisors (58745115).

71528805 is a wasteful number, since it uses less digits than its factorization.

71528805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12978 (or 12972 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 71528805 is about 8457.4703664867. The cubic root of 71528805 is about 415.1072544189.

The spelling of 71528805 in words is "seventy-one million, five hundred twenty-eight thousand, eight hundred five".