71738781 has 4 divisors (see below), whose sum is σ = 95651712. Its totient is φ = 47825852.

The previous prime is 71738761. The next prime is 71738783. The reversal of 71738781 is 18783717.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71738781 - 2¹¹ = 71736733 is a prime.

It is a super-2 number, since 2×71738781² = 10292905398731922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71738783) 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 3 ways as a sum of consecutive naturals, for example, 11956461 + ... + 11956466.

It is an arithmetic number, because the mean of its divisors is an integer number (23912928).

Almost surely, 2^71738781 is an apocalyptic number.

It is an amenable number.

71738781 is a deficient number, since it is larger than the sum of its proper divisors (23912931).

71738781 is a wasteful number, since it uses less digits than its factorization.

71738781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23912930.

The product of its digits is 65856, while the sum is 42.

The square root of 71738781 is about 8469.8749105285. The cubic root of 71738781 is about 415.5130462293.

The spelling of 71738781 in words is "seventy-one million, seven hundred thirty-eight thousand, seven hundred eighty-one".