71072747 has 4 divisors (see below), whose sum is σ = 72237936. Its totient is φ = 69907560.

The previous prime is 71072713. The next prime is 71072777. The reversal of 71072747 is 74727017.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71072747 - 2²² = 66878443 is a prime.

It is a super-3 number, since 3×71072747³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71072777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 582503 + ... + 582624.

It is an arithmetic number, because the mean of its divisors is an integer number (18059484).

Almost surely, 2^71072747 is an apocalyptic number.

71072747 is a deficient number, since it is larger than the sum of its proper divisors (1165189).

71072747 is a wasteful number, since it uses less digits than its factorization.

71072747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165188.

The product of its (nonzero) digits is 19208, while the sum is 35.

The square root of 71072747 is about 8430.4654082678. The cubic root of 71072747 is about 414.2231501751.

The spelling of 71072747 in words is "seventy-one million, seventy-two thousand, seven hundred forty-seven".