78428669441 has 8 divisors (see below), whose sum is σ = 79051329000. Its totient is φ = 77807294080.

The previous prime is 78428669411. The next prime is 78428669447. The reversal of 78428669441 is 14496682487.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 766127041 + 77662542400 = 27679^2 + 278680^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 78428669441 - 2¹⁸ = 78428407297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78428669447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198236 + ... + 442893.

It is an arithmetic number, because the mean of its divisors is an integer number (9881416125).

Almost surely, 2^78428669441 is an apocalyptic number.

It is an amenable number.

78428669441 is a deficient number, since it is larger than the sum of its proper divisors (622659559).

78428669441 is a wasteful number, since it uses less digits than its factorization.

78428669441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642099.

The product of its digits is 18579456, while the sum is 59.

The spelling of 78428669441 in words is "seventy-eight billion, four hundred twenty-eight million, six hundred sixty-nine thousand, four hundred forty-one".