9778907794 has 4 divisors (see below), whose sum is σ = 14668361694. Its totient is φ = 4889453896.

The previous prime is 9778907779. The next prime is 9778907813. The reversal of 9778907794 is 4977098779.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4977098779 = 36523 ⋅136273.

It can be written as a sum of positive squares in only one way, i.e., 7295380569 + 2483527225 = 85413^2 + 49835^2 .

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2444726947 + ... + 2444726950.

Almost surely, 2^9778907794 is an apocalyptic number.

9778907794 is a deficient number, since it is larger than the sum of its proper divisors (4889453900).

9778907794 is a wasteful number, since it uses less digits than its factorization.

9778907794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4889453899.

The product of its (nonzero) digits is 56010528, while the sum is 67.

The square root of 9778907794 is about 98888.3602553910. The cubic root of 9778907794 is about 2138.4385933201.

The spelling of 9778907794 in words is "nine billion, seven hundred seventy-eight million, nine hundred seven thousand, seven hundred ninety-four".