78815201389 has 32 divisors (see below), whose sum is σ = 87245786880. Its totient is φ = 70905139200.

The previous prime is 78815201371. The next prime is 78815201449. The reversal of 78815201389 is 98310251887.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78815201389 - 2¹¹ = 78815199341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78815201089) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5190969 + ... + 5206129.

It is an arithmetic number, because the mean of its divisors is an integer number (2726430840).

Almost surely, 2^78815201389 is an apocalyptic number.

It is an amenable number.

78815201389 is a deficient number, since it is larger than the sum of its proper divisors (8430585491).

78815201389 is a wasteful number, since it uses less digits than its factorization.

78815201389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15381.

The product of its (nonzero) digits is 967680, while the sum is 52.

The spelling of 78815201389 in words is "seventy-eight billion, eight hundred fifteen million, two hundred one thousand, three hundred eighty-nine".