9778997494 has 32 divisors (see below), whose sum is σ = 17181460800. Its totient is φ = 4086735360.

The previous prime is 9778997477. The next prime is 9778997497. The reversal of 9778997494 is 4947998779.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9778997497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1839312 + ... + 1844620.

It is an arithmetic number, because the mean of its divisors is an integer number (536920650).

Almost surely, 2^9778997494 is an apocalyptic number.

9778997494 is a deficient number, since it is larger than the sum of its proper divisors (7402463306).

9778997494 is a wasteful number, since it uses less digits than its factorization.

9778997494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8568.

The product of its digits is 288054144, while the sum is 73.

The square root of 9778997494 is about 98888.8137961013. The cubic root of 9778997494 is about 2138.4451317924.

The spelling of 9778997494 in words is "nine billion, seven hundred seventy-eight million, nine hundred ninety-seven thousand, four hundred ninety-four".