78798940647 has 16 divisors (see below), whose sum is σ = 120172157952. Its totient is φ = 44991372960.

The previous prime is 78798940643. The next prime is 78798940669. The reversal of 78798940647 is 74604989787.

It is not a de Polignac number, because 78798940647 - 2² = 78798940643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78798940643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1498248 + ... + 1549949.

It is an arithmetic number, because the mean of its divisors is an integer number (7510759872).

Almost surely, 2^78798940647 is an apocalyptic number.

78798940647 is a deficient number, since it is larger than the sum of its proper divisors (41373217305).

78798940647 is a wasteful number, since it uses less digits than its factorization.

78798940647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3049438.

The product of its (nonzero) digits is 170698752, while the sum is 69.

The spelling of 78798940647 in words is "seventy-eight billion, seven hundred ninety-eight million, nine hundred forty thousand, six hundred forty-seven".