9890145888 has 72 divisors (see below), whose sum is σ = 30200281272. Its totient is φ = 2825754624.

The previous prime is 9890145883. The next prime is 9890145901. The reversal of 9890145888 is 8885410989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9890145883) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1046545 + ... + 1055952.

It is an arithmetic number, because the mean of its divisors is an integer number (419448351).

Almost surely, 2^9890145888 is an apocalyptic number.

9890145888 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is an amenable number.

9890145888 is an abundant number, since it is smaller than the sum of its proper divisors (20310135384).

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

9890145888 is a wasteful number, since it uses less digits than its factorization.

9890145888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102524 (or 2102509 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 60.

The square root of 9890145888 is about 99449.2126062343. The cubic root of 9890145888 is about 2146.5165070349.

The spelling of 9890145888 in words is "nine billion, eight hundred ninety million, one hundred forty-five thousand, eight hundred eighty-eight".