78904890329 has 4 divisors (see below), whose sum is σ = 83546354484. Its totient is φ = 74263426176.

The previous prime is 78904890287. The next prime is 78904890359. The reversal of 78904890329 is 92309840987.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71849730304 + 7055160025 = 268048^2 + 83995^2 .

It is a cyclic number.

It is not a de Polignac number, because 78904890329 - 2¹² = 78904886233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78904890359) 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 3 ways as a sum of consecutive naturals, for example, 2320732052 + ... + 2320732085.

It is an arithmetic number, because the mean of its divisors is an integer number (20886588621).

Almost surely, 2^78904890329 is an apocalyptic number.

It is an amenable number.

78904890329 is a deficient number, since it is larger than the sum of its proper divisors (4641464155).

78904890329 is a wasteful number, since it uses less digits than its factorization.

78904890329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4641464154.

The product of its (nonzero) digits is 7838208, while the sum is 59.

The spelling of 78904890329 in words is "seventy-eight billion, nine hundred four million, eight hundred ninety thousand, three hundred twenty-nine".