8581903920 has 60 divisors (see below), whose sum is σ = 28820896416. Its totient is φ = 2288507520.

The previous prime is 8581903903. The next prime is 8581903933. The reversal of 8581903920 is 293091858.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×8581903920² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5958936 + ... + 5960375.

Almost surely, 2^8581903920 is an apocalyptic number.

8581903920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8581903920 is an abundant number, since it is smaller than the sum of its proper divisors (20238992496).

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

8581903920 is a wasteful number, since it uses less digits than its factorization.

8581903920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11919330 (or 11919321 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 8581903920 is about 92638.5660510783. The cubic root of 8581903920 is about 2047.3615805381.

The spelling of 8581903920 in words is "eight billion, five hundred eighty-one million, nine hundred three thousand, nine hundred twenty".