71738881 has 4 divisors (see below), whose sum is σ = 72220500. Its totient is φ = 71257264.

The previous prime is 71738869. The next prime is 71738911. The reversal of 71738881 is 18883717.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18883717 = 59 ⋅320063.

It can be written as a sum of positive squares in 2 ways, for example, as 10758400 + 60980481 = 3280^2 + 7809^2 .

It is a cyclic number.

It is not a de Polignac number, because 71738881 - 2⁷ = 71738753 is a prime.

It is a super-2 number, since 2×71738881² = 10292934094264322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71738801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240586 + ... + 240883.

It is an arithmetic number, because the mean of its divisors is an integer number (18055125).

Almost surely, 2^71738881 is an apocalyptic number.

It is an amenable number.

71738881 is a deficient number, since it is larger than the sum of its proper divisors (481619).

71738881 is a wasteful number, since it uses less digits than its factorization.

71738881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481618.

The product of its digits is 75264, while the sum is 43.

The square root of 71738881 is about 8469.8808138013. The cubic root of 71738881 is about 415.5132392968.

The spelling of 71738881 in words is "seventy-one million, seven hundred thirty-eight thousand, eight hundred eighty-one".