71528665 has 8 divisors (see below), whose sum is σ = 92437128. Its totient is φ = 52821120.

The previous prime is 71528663. The next prime is 71528671. The reversal of 71528665 is 56682517.

It can be written as a sum of positive squares in 4 ways, for example, as 227529 + 71301136 = 477^2 + 8444^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71528665 - 2¹ = 71528663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71528663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 550156 + ... + 550285.

It is an arithmetic number, because the mean of its divisors is an integer number (11554641).

Almost surely, 2^71528665 is an apocalyptic number.

It is an amenable number.

71528665 is a deficient number, since it is larger than the sum of its proper divisors (20908463).

71528665 is a wasteful number, since it uses less digits than its factorization.

71528665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100459.

The product of its digits is 100800, while the sum is 40.

The square root of 71528665 is about 8457.4620897761. The cubic root of 71528665 is about 415.1069835954.

The spelling of 71528665 in words is "seventy-one million, five hundred twenty-eight thousand, six hundred sixty-five".