9621667840 has 68 divisors (see below), whose sum is σ = 23092613064. Its totient is φ = 3848536064.

The previous prime is 9621667829. The next prime is 9621667843. The reversal of 9621667840 is 487661269.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9621667843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312999 + ... + 342361.

Almost surely, 2^9621667840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9621667840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11546306532).

9621667840 is an abundant number, since it is smaller than the sum of its proper divisors (13470945224).

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

9621667840 is an frugal number, since it uses more digits than its factorization.

9621667840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29400 (or 29370 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 49.

The square root of 9621667840 is about 98090.1006218263. The cubic root of 9621667840 is about 2126.9149310157.

The spelling of 9621667840 in words is "nine billion, six hundred twenty-one million, six hundred sixty-seven thousand, eight hundred forty".