9909674778 has 8 divisors (see below), whose sum is σ = 19819349568. Its totient is φ = 3303224924.

The previous prime is 9909674777. The next prime is 9909674783. The reversal of 9909674778 is 8774769099.

It is a sphenic number, since it is the product of 3 distinct primes.

9909674778 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (9909674771) 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, 825806226 + ... + 825806237.

It is an arithmetic number, because the mean of its divisors is an integer number (2477418696).

Almost surely, 2^9909674778 is an apocalyptic number.

9909674778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

9909674778 is a wasteful number, since it uses less digits than its factorization.

9909674778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651612468.

The product of its (nonzero) digits is 48009024, while the sum is 66.

The square root of 9909674778 is about 99547.3494272951. The cubic root of 9909674778 is about 2147.9284014121.

The spelling of 9909674778 in words is "nine billion, nine hundred nine million, six hundred seventy-four thousand, seven hundred seventy-eight".