71221039764 has 48 divisors (see below), whose sum is σ = 191060072448. Its totient is φ = 20227015008.

The previous prime is 71221039733. The next prime is 71221039787. The reversal of 71221039764 is 46793012217.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2524504 + ... + 2552559.

It is an arithmetic number, because the mean of its divisors is an integer number (3980418176).

Almost surely, 2^71221039764 is an apocalyptic number.

It is an amenable number.

71221039764 is an abundant number, since it is smaller than the sum of its proper divisors (119839032684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71221039764 is a wasteful number, since it uses less digits than its factorization.

71221039764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5077244 (or 5077242 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 42.

The spelling of 71221039764 in words is "seventy-one billion, two hundred twenty-one million, thirty-nine thousand, seven hundred sixty-four".