78697346450 has 54 divisors (see below), whose sum is σ = 148264165341. Its totient is φ = 31078241280.

The previous prime is 78697346447. The next prime is 78697346459. The reversal of 78697346450 is 5464379687.

It can be written as a sum of positive squares in 14 ways, for example, as 6637849729 + 72059496721 = 81473^2 + 268439^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=198365.

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 78697346450.

It is not an unprimeable number, because it can be changed into a prime (78697346459) 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 26 ways as a sum of consecutive naturals, for example, 192413846 + ... + 192414254.

Almost surely, 2^78697346450 is an apocalyptic number.

78697346450 is a deficient number, since it is larger than the sum of its proper divisors (69566818891).

78697346450 is an frugal number, since it uses more digits than its factorization.

78697346450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024 (or 513 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 59.

The spelling of 78697346450 in words is "seventy-eight billion, six hundred ninety-seven million, three hundred forty-six thousand, four hundred fifty".