9818861628 has 24 divisors (see below), whose sum is σ = 22921252480. Its totient is φ = 3271443120.

The previous prime is 9818861623. The next prime is 9818861639. The reversal of 9818861628 is 8261688189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9818861623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161608 + ... + 213903.

Almost surely, 2^9818861628 is an apocalyptic number.

It is an amenable number.

9818861628 is an abundant number, since it is smaller than the sum of its proper divisors (13102390852).

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

9818861628 is a wasteful number, since it uses less digits than its factorization.

9818861628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377697 (or 377695 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 57.

The square root of 9818861628 is about 99090.1691793893. The cubic root of 9818861628 is about 2141.3469864388.

The spelling of 9818861628 in words is "nine billion, eight hundred eighteen million, eight hundred sixty-one thousand, six hundred twenty-eight".