8990261280 has 1512 divisors, whose sum is σ = 43849686636. Its totient is φ = 1724405760.

The previous prime is 8990261257. The next prime is 8990261333. The reversal of 8990261280 is 821620998.

It can be written as a sum of positive squares in 2 ways, for example, as 8367858576 + 622402704 = 91476^2 + 24948^2 .

It is a tau number, because it is divible by the number of its divisors (1512).

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

It is an unprimeable number.

It is a polite number, since it can be written in 251 ways as a sum of consecutive naturals, for example, 691558554 + ... + 691558566.

Almost surely, 2^8990261280 is an apocalyptic number.

8990261280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8990261280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21924843318).

8990261280 is an abundant number, since it is smaller than the sum of its proper divisors (34859425356).

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

8990261280 is a wasteful number, since it uses less digits than its factorization.

8990261280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 8990261280 is about 94816.9883512443. The cubic root of 8990261280 is about 2079.3332799031. Note that the first 3 decimals are identical.

The spelling of 8990261280 in words is "eight billion, nine hundred ninety million, two hundred sixty-one thousand, two hundred eighty".