78836691652 has 12 divisors (see below), whose sum is σ = 141692973100. Its totient is φ = 38352985056.

The previous prime is 78836691649. The next prime is 78836691653. The reversal of 78836691652 is 25619663887.

It can be written as a sum of positive squares in 2 ways, for example, as 37393503876 + 41443187776 = 193374^2 + 203576^2 .

It is not an unprimeable number, because it can be changed into a prime (78836691653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266340027 + ... + 266340322.

Almost surely, 2^78836691652 is an apocalyptic number.

It is an amenable number.

78836691652 is a deficient number, since it is larger than the sum of its proper divisors (62856281448).

78836691652 is a wasteful number, since it uses less digits than its factorization.

78836691652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532680390 (or 532680388 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 61.

The spelling of 78836691652 in words is "seventy-eight billion, eight hundred thirty-six million, six hundred ninety-one thousand, six hundred fifty-two".