9869720849890 has 16 divisors (see below), whose sum is σ = 19380542760000. Its totient is φ = 3588989399920.

The previous prime is 9869720849773. The next prime is 9869720849893. The reversal of 9869720849890 is 989480279689.

It is a super-2 number, since 2×9869720849890² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9869720849890.

It is not an unprimeable number, because it can be changed into a prime (9869720849893) 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, 44862367390 + ... + 44862367609.

It is an arithmetic number, because the mean of its divisors is an integer number (1211283922500).

Almost surely, 2^{9869720849890} is an apocalyptic number.

9869720849890 is a deficient number, since it is larger than the sum of its proper divisors (9510821910110).

9869720849890 is a wasteful number, since it uses less digits than its factorization.

9869720849890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89724735017.

The product of its (nonzero) digits is 1128701952, while the sum is 79.

The spelling of 9869720849890 in words is "nine trillion, eight hundred sixty-nine billion, seven hundred twenty million, eight hundred forty-nine thousand, eight hundred ninety".