78364002905 has 4 divisors (see below), whose sum is σ = 94036803492. Its totient is φ = 62691202320.

The previous prime is 78364002889. The next prime is 78364002923. The reversal of 78364002905 is 50920046387.

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 49374173209 + 28989829696 = 222203^2 + 170264^2 .

It is not a de Polignac number, because 78364002905 - 2⁴ = 78364002889 is a prime.

It is a super-2 number, since 2×78364002905² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7836400286 + ... + 7836400295.

It is an arithmetic number, because the mean of its divisors is an integer number (23509200873).

Almost surely, 2^78364002905 is an apocalyptic number.

It is an amenable number.

78364002905 is a deficient number, since it is larger than the sum of its proper divisors (15672800587).

78364002905 is a wasteful number, since it uses less digits than its factorization.

78364002905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15672800586.

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 78364002905 in words is "seventy-eight billion, three hundred sixty-four million, two thousand, nine hundred five".