9938872578 has 16 divisors (see below), whose sum is σ = 20300676480. Its totient is φ = 3242468976.

The previous prime is 9938872577. The next prime is 9938872609. The reversal of 9938872578 is 8752788399.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (9938872577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17621833 + ... + 17622396.

It is an arithmetic number, because the mean of its divisors is an integer number (1268792280).

Almost surely, 2^9938872578 is an apocalyptic number.

9938872578 is an abundant number, since it is smaller than the sum of its proper divisors (10361803902).

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

9938872578 is a wasteful number, since it uses less digits than its factorization.

9938872578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35244281.

The product of its digits is 60963840, while the sum is 66.

The square root of 9938872578 is about 99693.8943867677. The cubic root of 9938872578 is about 2150.0358802738.

The spelling of 9938872578 in words is "nine billion, nine hundred thirty-eight million, eight hundred seventy-two thousand, five hundred seventy-eight".