78834431506 has 8 divisors (see below), whose sum is σ = 119470736700. Its totient is φ = 39010852608.

The previous prime is 78834431491. The next prime is 78834431519. The reversal of 78834431506 is 60513443887.

It can be written as a sum of positive squares in 2 ways, for example, as 78227055481 + 607376025 = 279691^2 + 24645^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 78834431506.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 203181331 + ... + 203181718.

Almost surely, 2^78834431506 is an apocalyptic number.

78834431506 is a deficient number, since it is larger than the sum of its proper divisors (40636305194).

78834431506 is a wasteful number, since it uses less digits than its factorization.

78834431506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406363148.

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 78834431506 in words is "seventy-eight billion, eight hundred thirty-four million, four hundred thirty-one thousand, five hundred six".