9648778399 has 4 divisors (see below), whose sum is σ = 10390992136. Its totient is φ = 8906564664.

The previous prime is 9648778367. The next prime is 9648778409. The reversal of 9648778399 is 9938778469.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9648778399 - 2⁵ = 9648778367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9648778499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371106849 + ... + 371106874.

It is an arithmetic number, because the mean of its divisors is an integer number (2597748034).

Almost surely, 2^9648778399 is an apocalyptic number.

9648778399 is a deficient number, since it is larger than the sum of its proper divisors (742213737).

9648778399 is a wasteful number, since it uses less digits than its factorization.

9648778399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742213736.

The product of its digits is 164602368, while the sum is 70.

The square root of 9648778399 is about 98228.1955397736. The cubic root of 9648778399 is about 2128.9106965868.

Adding to 9648778399 its sum of digits (70), we get a palindrome (9648778469).

The spelling of 9648778399 in words is "nine billion, six hundred forty-eight million, seven hundred seventy-eight thousand, three hundred ninety-nine".