77890751686 has 16 divisors (see below), whose sum is σ = 128029160448. Its totient is φ = 35246118600.

The previous prime is 77890751669. The next prime is 77890751689. The reversal of 77890751686 is 68615709877.

It is a super-2 number, since 2×77890751686² (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 (77890751689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7933410 + ... + 7943221.

It is an arithmetic number, because the mean of its divisors is an integer number (8001822528).

Almost surely, 2^77890751686 is an apocalyptic number.

77890751686 is a deficient number, since it is larger than the sum of its proper divisors (50138408762).

77890751686 is a wasteful number, since it uses less digits than its factorization.

77890751686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15876867.

The product of its (nonzero) digits is 35562240, while the sum is 64.

The spelling of 77890751686 in words is "seventy-seven billion, eight hundred ninety million, seven hundred fifty-one thousand, six hundred eighty-six".