71528891 has 8 divisors (see below), whose sum is σ = 82782720. Its totient is φ = 60533928.

The previous prime is 71528861. The next prime is 71528893. The reversal of 71528891 is 19882517.

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

It is a de Polignac number, because none of the positive numbers 2^k-71528891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71528893) 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, 64121 + ... + 65226.

It is an arithmetic number, because the mean of its divisors is an integer number (10347840).

Almost surely, 2^71528891 is an apocalyptic number.

71528891 is a deficient number, since it is larger than the sum of its proper divisors (11253829).

71528891 is a wasteful number, since it uses less digits than its factorization.

71528891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129433.

The product of its digits is 40320, while the sum is 41.

The square root of 71528891 is about 8457.4754507477. The cubic root of 71528891 is about 415.1074207818.

The spelling of 71528891 in words is "seventy-one million, five hundred twenty-eight thousand, eight hundred ninety-one".