71533505 has 8 divisors (see below), whose sum is σ = 85890024. Its totient is φ = 57193600.

The previous prime is 71533493. The next prime is 71533513. The reversal of 71533505 is 50533517.

It can be written as a sum of positive squares in 4 ways, for example, as 283024 + 71250481 = 532^2 + 8441^2 .

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

It is not a de Polignac number, because 71533505 - 2⁴ = 71533489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9275 + ... + 15135.

It is an arithmetic number, because the mean of its divisors is an integer number (10736253).

Almost surely, 2^71533505 is an apocalyptic number.

It is an amenable number.

71533505 is a deficient number, since it is larger than the sum of its proper divisors (14356519).

71533505 is a wasteful number, since it uses less digits than its factorization.

71533505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8307.

The product of its (nonzero) digits is 7875, while the sum is 29.

The square root of 71533505 is about 8457.7482227837. The cubic root of 71533505 is about 415.1163461471.

The spelling of 71533505 in words is "seventy-one million, five hundred thirty-three thousand, five hundred five".