71744781 has 16 divisors (see below), whose sum is σ = 97243520. Its totient is φ = 47044800.

The previous prime is 71744773. The next prime is 71744801. The reversal of 71744781 is 18744717.

It is not a de Polignac number, because 71744781 - 2³ = 71744773 is a prime.

It is a super-2 number, since 2×71744781² = 10294627201475922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71744381) by changing a digit.

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, 48651 + ... + 50103.

It is an arithmetic number, because the mean of its divisors is an integer number (6077720).

Almost surely, 2^71744781 is an apocalyptic number.

It is an amenable number.

71744781 is a deficient number, since it is larger than the sum of its proper divisors (25498739).

71744781 is a wasteful number, since it uses less digits than its factorization.

71744781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716.

The product of its digits is 43904, while the sum is 39.

The square root of 71744781 is about 8470.2290996171. The cubic root of 71744781 is about 415.5246299628.

The spelling of 71744781 in words is "seventy-one million, seven hundred forty-four thousand, seven hundred eighty-one".