9928581390 has 144 divisors (see below), whose sum is σ = 32338994688. Its totient is φ = 2094809472.

The previous prime is 9928581331. The next prime is 9928581401. The reversal of 9928581390 is 931858299.

9928581390 is a `hidden beast` number, since 9 + 9 + 28 + 581 + 39 + 0 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 29262 + ... + 143921.

It is an arithmetic number, because the mean of its divisors is an integer number (224576352).

Almost surely, 2^9928581390 is an apocalyptic number.

9928581390 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 9928581390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16169497344).

9928581390 is an abundant number, since it is smaller than the sum of its proper divisors (22410413298).

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

9928581390 is a wasteful number, since it uses less digits than its factorization.

9928581390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173223 (or 173213 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The square root of 9928581390 is about 99642.2670858105. The cubic root of 9928581390 is about 2149.2935403824.

The spelling of 9928581390 in words is "nine billion, nine hundred twenty-eight million, five hundred eighty-one thousand, three hundred ninety".