77987886959478 has 16 divisors (see below), whose sum is σ = 156675216854016. Its totient is φ = 25879388497320.

The previous prime is 77987886959453. The next prime is 77987886959513. The reversal of 77987886959478 is 87495968878977.

It is a super-2 number, since 2×77987886959478² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29143454178 + ... + 29143456853.

It is an arithmetic number, because the mean of its divisors is an integer number (9792201053376).

Almost surely, 2^{77987886959478} is an apocalyptic number.

77987886959478 is an abundant number, since it is smaller than the sum of its proper divisors (78687329894538).

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

77987886959478 is a wasteful number, since it uses less digits than its factorization.

77987886959478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58286911259.

The product of its digits is 860321710080, while the sum is 102.

The spelling of 77987886959478 in words is "seventy-seven trillion, nine hundred eighty-seven billion, eight hundred eighty-six million, nine hundred fifty-nine thousand, four hundred seventy-eight".