71277339728 has 20 divisors (see below), whose sum is σ = 157828395360. Its totient is φ = 30547431264.

The previous prime is 71277339709. The next prime is 71277339737. The reversal of 71277339728 is 82793377217.

It is a happy number.

It is a super-2 number, since 2×71277339728² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318202298 + ... + 318202521.

It is an arithmetic number, because the mean of its divisors is an integer number (7891419768).

Almost surely, 2^71277339728 is an apocalyptic number.

It is an amenable number.

71277339728 is an abundant number, since it is smaller than the sum of its proper divisors (86551055632).

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

71277339728 is a wasteful number, since it uses less digits than its factorization.

71277339728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636404834 (or 636404828 counting only the distinct ones).

The product of its digits is 6223392, while the sum is 56.

The spelling of 71277339728 in words is "seventy-one billion, two hundred seventy-seven million, three hundred thirty-nine thousand, seven hundred twenty-eight".