78283642771 has 4 divisors (see below), whose sum is σ = 82888562952. Its totient is φ = 73678722592.

The previous prime is 78283642727. The next prime is 78283642783. The reversal of 78283642771 is 17724638287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17724638287 = 127 ⋅139564081.

It is a cyclic number.

It is not a de Polignac number, because 78283642771 - 2⁷ = 78283642643 is a prime.

It is a super-2 number, since 2×78283642771² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78283642571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2302460065 + ... + 2302460098.

It is an arithmetic number, because the mean of its divisors is an integer number (20722140738).

Almost surely, 2^78283642771 is an apocalyptic number.

78283642771 is a deficient number, since it is larger than the sum of its proper divisors (4604920181).

78283642771 is a wasteful number, since it uses less digits than its factorization.

78283642771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4604920180.

The product of its digits is 6322176, while the sum is 55.

The spelling of 78283642771 in words is "seventy-eight billion, two hundred eighty-three million, six hundred forty-two thousand, seven hundred seventy-one".