78687645852 has 24 divisors (see below), whose sum is σ = 183748096000. Its totient is φ = 26208702576.

The previous prime is 78687645851. The next prime is 78687645877. The reversal of 78687645852 is 25854678687.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78687645851) 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, 2548102 + ... + 2578797.

Almost surely, 2^78687645852 is an apocalyptic number.

It is an amenable number.

78687645852 is an abundant number, since it is smaller than the sum of its proper divisors (105060450148).

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

78687645852 is a wasteful number, since it uses less digits than its factorization.

78687645852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5128185 (or 5128183 counting only the distinct ones).

The product of its digits is 180633600, while the sum is 66.

The spelling of 78687645852 in words is "seventy-eight billion, six hundred eighty-seven million, six hundred forty-five thousand, eight hundred fifty-two".