78785191907 has 8 divisors (see below), whose sum is σ = 81034066416. Its totient is φ = 76542609312.

The previous prime is 78785191889. The next prime is 78785191973. The reversal of 78785191907 is 70919158787.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 78785191907 - 2⁸ = 78785191651 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78785191907.

It is not an unprimeable number, because it can be changed into a prime (78785190907) 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, 1547573 + ... + 1597670.

It is an arithmetic number, because the mean of its divisors is an integer number (10129258302).

Almost surely, 2^78785191907 is an apocalyptic number.

78785191907 is a deficient number, since it is larger than the sum of its proper divisors (2248874509).

78785191907 is a wasteful number, since it uses less digits than its factorization.

78785191907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3145957.

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

Adding to 78785191907 its sum of digits (62), we get a square (78785191969 = 280687²).

The spelling of 78785191907 in words is "seventy-eight billion, seven hundred eighty-five million, one hundred ninety-one thousand, nine hundred seven".