78644403315 has 48 divisors (see below), whose sum is σ = 137121341760. Its totient is φ = 41696501760.

The previous prime is 78644403311. The next prime is 78644403377. The reversal of 78644403315 is 51330444687.

It is not a de Polignac number, because 78644403315 - 2² = 78644403311 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (78644403311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17706495 + ... + 17710935.

It is an arithmetic number, because the mean of its divisors is an integer number (2856694620).

Almost surely, 2^78644403315 is an apocalyptic number.

78644403315 is a deficient number, since it is larger than the sum of its proper divisors (58476938445).

78644403315 is a wasteful number, since it uses less digits than its factorization.

78644403315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6684 (or 6681 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 45.

The spelling of 78644403315 in words is "seventy-eight billion, six hundred forty-four million, four hundred three thousand, three hundred fifteen".