78665879700 has 126 divisors (see below), whose sum is σ = 255940594014. Its totient is φ = 20977548480.

The previous prime is 78665879627. The next prime is 78665879707. The reversal of 78665879700 is 797856687.

It can be written as a sum of positive squares in 3 ways, for example, as 1356301584 + 77309578116 = 36828^2 + 278046^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78665879707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 466647 + ... + 612446.

Almost surely, 2^78665879700 is an apocalyptic number.

It is an amenable number.

78665879700 is an abundant number, since it is smaller than the sum of its proper divisors (177274714314).

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

78665879700 is a wasteful number, since it uses less digits than its factorization.

78665879700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079125 (or 1079103 counting only the distinct ones).

The product of its (nonzero) digits is 35562240, while the sum is 63.

The spelling of 78665879700 in words is "seventy-eight billion, six hundred sixty-five million, eight hundred seventy-nine thousand, seven hundred".