71506905 has 16 divisors (see below), whose sum is σ = 114618240. Its totient is φ = 38067968.

The previous prime is 71506891. The next prime is 71506927. The reversal of 71506905 is 50960517.

It is a cyclic number.

It is not a de Polignac number, because 71506905 - 2¹¹ = 71504857 is a prime.

It is a super-2 number, since 2×71506905² = 10226474925358050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4876 + ... + 12914.

It is an arithmetic number, because the mean of its divisors is an integer number (7163640).

Almost surely, 2^71506905 is an apocalyptic number.

It is an amenable number.

71506905 is a deficient number, since it is larger than the sum of its proper divisors (43111335).

71506905 is a wasteful number, since it uses less digits than its factorization.

71506905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8640.

The product of its (nonzero) digits is 9450, while the sum is 33.

The square root of 71506905 is about 8456.1755539960. The cubic root of 71506905 is about 415.0648855820.

The spelling of 71506905 in words is "seventy-one million, five hundred six thousand, nine hundred five".