77887778632 has 16 divisors (see below), whose sum is σ = 146359153260. Its totient is φ = 38858671104.

The previous prime is 77887778623. The next prime is 77887778641. The reversal of 77887778632 is 23687778877.

It is an interprime number because it is at equal distance from previous prime (77887778623) and next prime (77887778641).

It can be written as a sum of positive squares in 2 ways, for example, as 67343364036 + 10544414596 = 259506^2 + 102686^2 .

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, 10648393 + ... + 10655704.

Almost surely, 2^77887778632 is an apocalyptic number.

It is an amenable number.

77887778632 is a deficient number, since it is larger than the sum of its proper divisors (68471374628).

77887778632 is a wasteful number, since it uses less digits than its factorization.

77887778632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21304560 (or 21304556 counting only the distinct ones).

The product of its digits is 309786624, while the sum is 70.

The spelling of 77887778632 in words is "seventy-seven billion, eight hundred eighty-seven million, seven hundred seventy-eight thousand, six hundred thirty-two".