78785191970 has 8 divisors (see below), whose sum is σ = 141813345564. Its totient is φ = 31514076784.

The previous prime is 78785191889. The next prime is 78785191973. The reversal of 78785191970 is 7919158787.

It is a happy number.

It is a Cunningham number, because it is equal to 280687²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 78785191969 + 1 = 280687^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (78785191973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3939259589 + ... + 3939259608.

Almost surely, 2^78785191970 is an apocalyptic number.

78785191970 is a deficient number, since it is larger than the sum of its proper divisors (63028153594).

78785191970 is a wasteful number, since it uses less digits than its factorization.

78785191970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7878519204.

The product of its (nonzero) digits is 8890560, while the sum is 62.

The spelling of 78785191970 in words is "seventy-eight billion, seven hundred eighty-five million, one hundred ninety-one thousand, nine hundred seventy".