9621198078 has 32 divisors (see below), whose sum is σ = 19343149056. Its totient is φ = 3190296288.

The previous prime is 9621198077. The next prime is 9621198091. The reversal of 9621198078 is 8708911269.

It is a super-2 number, since 2×9621198078² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9621198078.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9621198077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3312775 + ... + 3315677.

It is an arithmetic number, because the mean of its divisors is an integer number (604473408).

Almost surely, 2^9621198078 is an apocalyptic number.

9621198078 is an abundant number, since it is smaller than the sum of its proper divisors (9721950978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9621198078 is a wasteful number, since it uses less digits than its factorization.

9621198078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5608.

The product of its (nonzero) digits is 435456, while the sum is 51.

The square root of 9621198078 is about 98087.7060492292. The cubic root of 9621198078 is about 2126.8803160858.

The spelling of 9621198078 in words is "nine billion, six hundred twenty-one million, one hundred ninety-eight thousand, seventy-eight".