71187778730 has 16 divisors (see below), whose sum is σ = 130864343040. Its totient is φ = 27869257872.

The previous prime is 71187778721. The next prime is 71187778733. The reversal of 71187778730 is 3787778117.

It is a super-2 number, since 2×71187778730² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71187778733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75731210 + ... + 75732149.

It is an arithmetic number, because the mean of its divisors is an integer number (8179021440).

Almost surely, 2^71187778730 is an apocalyptic number.

71187778730 is a deficient number, since it is larger than the sum of its proper divisors (59676564310).

71187778730 is a wasteful number, since it uses less digits than its factorization.

71187778730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151463413.

The product of its (nonzero) digits is 3226944, while the sum is 56.

The spelling of 71187778730 in words is "seventy-one billion, one hundred eighty-seven million, seven hundred seventy-eight thousand, seven hundred thirty".