9809864640 has 140 divisors (see below), whose sum is σ = 34895506536. Its totient is φ = 2615956992.

The previous prime is 9809864609. The next prime is 9809864663. The reversal of 9809864640 is 464689089.

9809864640 is a `hidden beast` number, since 98 + 0 + 98 + 6 + 464 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 163314 + ... + 215153.

Almost surely, 2^9809864640 is an apocalyptic number.

9809864640 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

9809864640 is an abundant number, since it is smaller than the sum of its proper divisors (25085641896).

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

9809864640 is a wasteful number, since it uses less digits than its factorization.

9809864640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378496 (or 378477 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The square root of 9809864640 is about 99044.7607902609. The cubic root of 9809864640 is about 2140.6927503632.

The spelling of 9809864640 in words is "nine billion, eight hundred nine million, eight hundred sixty-four thousand, six hundred forty".