78747328773 has 6 divisors (see below), whose sum is σ = 113746141574. Its totient is φ = 52498219176.

The previous prime is 78747328729. The next prime is 78747328801. The reversal of 78747328773 is 37782374787.

78747328773 is a `hidden beast` number, since 7 + 87 + 473 + 2 + 87 + 7 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 69982998849 + 8764329924 = 264543^2 + 93618^2 .

It is not a de Polignac number, because 78747328773 - 2¹⁴ = 78747312389 is a prime.

It is a super-2 number, since 2×78747328773² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78747328773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78747328703) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4374851590 + ... + 4374851607.

Almost surely, 2^78747328773 is an apocalyptic number.

It is an amenable number.

78747328773 is a deficient number, since it is larger than the sum of its proper divisors (34998812801).

78747328773 is a wasteful number, since it uses less digits than its factorization.

78747328773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8749703203 (or 8749703200 counting only the distinct ones).

The product of its digits is 77446656, while the sum is 63.

The spelling of 78747328773 in words is "seventy-eight billion, seven hundred forty-seven million, three hundred twenty-eight thousand, seven hundred seventy-three".