71985747 has 8 divisors (see below), whose sum is σ = 96158656. Its totient is φ = 47901672.

The previous prime is 71985733. The next prime is 71985761. The reversal of 71985747 is 74758917.

It is an interprime number because it is at equal distance from previous prime (71985733) and next prime (71985761).

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

It is not a de Polignac number, because 71985747 - 2⁷ = 71985619 is a prime.

It is a super-2 number, since 2×71985747² = 10363895542296018, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71985696 and 71985705.

It is not an unprimeable number, because it can be changed into a prime (71985707) 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, 20293 + ... + 23574.

It is an arithmetic number, because the mean of its divisors is an integer number (12019832).

Almost surely, 2^71985747 is an apocalyptic number.

71985747 is a deficient number, since it is larger than the sum of its proper divisors (24172909).

71985747 is a wasteful number, since it uses less digits than its factorization.

71985747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44417.

The product of its digits is 493920, while the sum is 48.

The square root of 71985747 is about 8484.4414665905. The cubic root of 71985747 is about 415.9893114703.

The spelling of 71985747 in words is "seventy-one million, nine hundred eighty-five thousand, seven hundred forty-seven".