78328143257 has 8 divisors (see below), whose sum is σ = 96403868736. Its totient is φ = 61973915472.

The previous prime is 78328143251. The next prime is 78328143259. The reversal of 78328143257 is 75234182387.

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

It is not a de Polignac number, because 78328143257 - 2⁶ = 78328143193 is a prime.

It is a super-2 number, since 2×78328143257² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78328143251) 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 7 ways as a sum of consecutive naturals, for example, 430374323 + ... + 430374504.

It is an arithmetic number, because the mean of its divisors is an integer number (12050483592).

Almost surely, 2^78328143257 is an apocalyptic number.

It is an amenable number.

78328143257 is a deficient number, since it is larger than the sum of its proper divisors (18075725479).

78328143257 is a wasteful number, since it uses less digits than its factorization.

78328143257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860748847.

The product of its digits is 2257920, while the sum is 50.

The spelling of 78328143257 in words is "seventy-eight billion, three hundred twenty-eight million, one hundred forty-three thousand, two hundred fifty-seven".