71444781 has 16 divisors (see below), whose sum is σ = 106384000. Its totient is φ = 47386944.

The previous prime is 71444773. The next prime is 71444783. The reversal of 71444781 is 18744417.

It is not a de Polignac number, because 71444781 - 2³ = 71444773 is a prime.

It is a super-2 number, since 2×71444781² = 10208713464275922, 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 (71444783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1276 + ... + 12021.

It is an arithmetic number, because the mean of its divisors is an integer number (6649000).

Almost surely, 2^71444781 is an apocalyptic number.

It is an amenable number.

71444781 is a deficient number, since it is larger than the sum of its proper divisors (34939219).

71444781 is a wasteful number, since it uses less digits than its factorization.

71444781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13505 (or 13499 counting only the distinct ones).

The product of its digits is 25088, while the sum is 36.

The square root of 71444781 is about 8452.5014640638. The cubic root of 71444781 is about 414.9446502850.

The spelling of 71444781 in words is "seventy-one million, four hundred forty-four thousand, seven hundred eighty-one".