9009781408 has 36 divisors (see below), whose sum is σ = 17789378922. Its totient is φ = 4491876480.

The previous prime is 9009781387. The next prime is 9009781423. The reversal of 9009781408 is 8041879009.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7281550224 + 1728231184 = 85332^2 + 41572^2 .

It is a super-2 number, since 2×9009781408² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9574218 + ... + 9575158.

Almost surely, 2^9009781408 is an apocalyptic number.

It is an amenable number.

9009781408 is a deficient number, since it is larger than the sum of its proper divisors (8779597514).

9009781408 is an frugal number, since it uses more digits than its factorization.

9009781408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045 (or 1490 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 9009781408 is about 94919.8683522054. The cubic root of 9009781408 is about 2080.8371112781.

The spelling of 9009781408 in words is "nine billion, nine million, seven hundred eighty-one thousand, four hundred eight".