71264881 has 4 divisors (see below), whose sum is σ = 72065700. Its totient is φ = 70464064.

The previous prime is 71264857. The next prime is 71264891. The reversal of 71264881 is 18846217.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12895281 + 58369600 = 3591^2 + 7640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71264881 is a prime.

It is a super-2 number, since 2×71264881² = 10157366527888322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71264881.

It is not an unprimeable number, because it can be changed into a prime (71264821) 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, 400276 + ... + 400453.

It is an arithmetic number, because the mean of its divisors is an integer number (18016425).

Almost surely, 2^71264881 is an apocalyptic number.

It is an amenable number.

71264881 is a deficient number, since it is larger than the sum of its proper divisors (800819).

71264881 is an equidigital number, since it uses as much as digits as its factorization.

71264881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800818.

The product of its digits is 21504, while the sum is 37.

The square root of 71264881 is about 8441.8529364115. The cubic root of 71264881 is about 414.5960767197.

The spelling of 71264881 in words is "seventy-one million, two hundred sixty-four thousand, eight hundred eighty-one".