9997778 has 32 divisors (see below), whose sum is σ = 18213120. Its totient is φ = 4023360.

The previous prime is 9997777. The next prime is 9997783. The reversal of 9997778 is 8777999.

It is not an unprimeable number, because it can be changed into a prime (9997777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19388 + ... + 19896.

It is an arithmetic number, because the mean of its divisors is an integer number (569160).

Almost surely, 2^9997778 is an apocalyptic number.

9997778 is a deficient number, since it is larger than the sum of its proper divisors (8215342).

9997778 is a wasteful number, since it uses less digits than its factorization.

9997778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602.

The product of its digits is 2000376, while the sum is 56.

The square root of 9997778 is about 3161.9263116018. The cubic root of 9997778 is about 215.4275106415.

The spelling of 9997778 in words is "nine million, nine hundred ninety-seven thousand, seven hundred seventy-eight".