71528897 has 4 divisors (see below), whose sum is σ = 78031536. Its totient is φ = 65026260.

The previous prime is 71528893. The next prime is 71528917. The reversal of 71528897 is 79882517.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71528897 - 2² = 71528893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71528893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3251303 + ... + 3251324.

It is an arithmetic number, because the mean of its divisors is an integer number (19507884).

Almost surely, 2^71528897 is an apocalyptic number.

It is an amenable number.

71528897 is a deficient number, since it is larger than the sum of its proper divisors (6502639).

71528897 is a wasteful number, since it uses less digits than its factorization.

71528897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6502638.

The product of its digits is 282240, while the sum is 47.

The square root of 71528897 is about 8457.4758054635. The cubic root of 71528897 is about 415.1074323885.

The spelling of 71528897 in words is "seventy-one million, five hundred twenty-eight thousand, eight hundred ninety-seven".