71773281 has 12 divisors (see below), whose sum is σ = 105220752. Its totient is φ = 47134296.

The previous prime is 71773267. The next prime is 71773283. The reversal of 71773281 is 18237717.

It is a happy number.

It is not a de Polignac number, because 71773281 - 2⁶ = 71773217 is a prime.

It is a super-2 number, since 2×71773281² = 10302807731009922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71773283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58911 + ... + 60116.

It is an arithmetic number, because the mean of its divisors is an integer number (8768396).

Almost surely, 2^71773281 is an apocalyptic number.

It is an amenable number.

71773281 is a deficient number, since it is larger than the sum of its proper divisors (33447471).

71773281 is a wasteful number, since it uses less digits than its factorization.

71773281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119100 (or 119097 counting only the distinct ones).

The product of its digits is 16464, while the sum is 36.

The square root of 71773281 is about 8471.9112955696. The cubic root of 71773281 is about 415.5796438794.

The spelling of 71773281 in words is "seventy-one million, seven hundred seventy-three thousand, two hundred eighty-one".