71828884981 has 4 divisors (see below), whose sum is σ = 82090154272. Its totient is φ = 61567615692.

The previous prime is 71828884961. The next prime is 71828885033. The reversal of 71828884981 is 18948882817.

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 71828884981 - 2⁵ = 71828884949 is a prime.

It is a super-2 number, since 2×71828884981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71828884921) 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, 5130634635 + ... + 5130634648.

It is an arithmetic number, because the mean of its divisors is an integer number (20522538568).

Almost surely, 2^71828884981 is an apocalyptic number.

It is an amenable number.

71828884981 is a deficient number, since it is larger than the sum of its proper divisors (10261269291).

71828884981 is a wasteful number, since it uses less digits than its factorization.

71828884981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10261269290.

The product of its digits is 16515072, while the sum is 64.

The spelling of 71828884981 in words is "seventy-one billion, eight hundred twenty-eight million, eight hundred eighty-four thousand, nine hundred eighty-one".