78717977762 has 6 divisors (see below), whose sum is σ = 118077561819. Its totient is φ = 39358790490.

The previous prime is 78717977753. The next prime is 78717977827. The reversal of 78717977762 is 26777971787.

It can be written as a sum of positive squares in only one way, i.e., 39358988881 + 39358988881 = 198391^2 + 198391^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=198391.

It is a super-3 number, since 3×78717977762³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78717977692 and 78717977701.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 297587 + ... + 495977.

Almost surely, 2^78717977762 is an apocalyptic number.

78717977762 is a deficient number, since it is larger than the sum of its proper divisors (39359584057).

78717977762 is an frugal number, since it uses more digits than its factorization.

78717977762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396784 (or 198393 counting only the distinct ones).

The product of its digits is 101648736, while the sum is 68.

The spelling of 78717977762 in words is "seventy-eight billion, seven hundred seventeen million, nine hundred seventy-seven thousand, seven hundred sixty-two".