71528285 has 8 divisors (see below), whose sum is σ = 86719416. Its totient is φ = 56632320.

The previous prime is 71528263. The next prime is 71528287. The reversal of 71528285 is 58282517.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 27994681 + 43533604 = 5291^2 + 6598^2 .

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

It is not a de Polignac number, because 71528285 - 2¹⁴ = 71511901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71528287) 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, 73256 + ... + 74225.

It is an arithmetic number, because the mean of its divisors is an integer number (10839927).

Almost surely, 2^71528285 is an apocalyptic number.

It is an amenable number.

71528285 is a deficient number, since it is larger than the sum of its proper divisors (15191131).

71528285 is a wasteful number, since it uses less digits than its factorization.

71528285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147583.

The product of its digits is 44800, while the sum is 38.

The square root of 71528285 is about 8457.4396243781. The cubic root of 71528285 is about 415.1062485011.

The spelling of 71528285 in words is "seventy-one million, five hundred twenty-eight thousand, two hundred eighty-five".