71368781 has 4 divisors (see below), whose sum is σ = 77856864. Its totient is φ = 64880700.

The previous prime is 71368753. The next prime is 71368783. The reversal of 71368781 is 18786317.

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 71368781 - 2²² = 67174477 is a prime.

It is a super-2 number, since 2×71368781² = 10187005802851922, 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 (71368783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3244025 + ... + 3244046.

It is an arithmetic number, because the mean of its divisors is an integer number (19464216).

Almost surely, 2^71368781 is an apocalyptic number.

It is an amenable number.

71368781 is a deficient number, since it is larger than the sum of its proper divisors (6488083).

71368781 is a wasteful number, since it uses less digits than its factorization.

71368781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6488082.

The product of its digits is 56448, while the sum is 41.

The square root of 71368781 is about 8448.0045572904. The cubic root of 71368781 is about 414.7974644362.

The spelling of 71368781 in words is "seventy-one million, three hundred sixty-eight thousand, seven hundred eighty-one".