9904398128 has 20 divisors (see below), whose sum is σ = 20199759960. Its totient is φ = 4691556864.

The previous prime is 9904398121. The next prime is 9904398131. The reversal of 9904398128 is 8218934099.

It is a self number, because there is not a number n which added to its sum of digits gives 9904398128.

It is not an unprimeable number, because it can be changed into a prime (9904398121) 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, 16289825 + ... + 16290432.

It is an arithmetic number, because the mean of its divisors is an integer number (1009987998).

Almost surely, 2^9904398128 is an apocalyptic number.

It is an amenable number.

9904398128 is an abundant number, since it is smaller than the sum of its proper divisors (10295361832).

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

9904398128 is a wasteful number, since it uses less digits than its factorization.

9904398128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32580284 (or 32580278 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 53.

The square root of 9904398128 is about 99520.8426813198. The cubic root of 9904398128 is about 2147.5470946281.

The spelling of 9904398128 in words is "nine billion, nine hundred four million, three hundred ninety-eight thousand, one hundred twenty-eight".