9999022638420 has 144 divisors (see below), whose sum is σ = 32258521451520. Its totient is φ = 2498304826368.

The previous prime is 9999022638383. The next prime is 9999022638427. The reversal of 9999022638420 is 248362209999.

9999022638420 is a `hidden beast` number, since 9 + 9 + 9 + 9 + 0 + 226 + 384 + 20 = 666.

It is a super-3 number, since 3×9999022638420³ (a number of 40 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999022638427) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6644200 + ... + 8008959.

It is an arithmetic number, because the mean of its divisors is an integer number (224017510080).

Almost surely, 2^{9999022638420} is an apocalyptic number.

9999022638420 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

9999022638420 is an abundant number, since it is smaller than the sum of its proper divisors (22259498813100).

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

9999022638420 is a wasteful number, since it uses less digits than its factorization.

9999022638420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14653414 (or 14653409 counting only the distinct ones).

The product of its (nonzero) digits is 30233088, while the sum is 63.

The spelling of 9999022638420 in words is "nine trillion, nine hundred ninety-nine billion, twenty-two million, six hundred thirty-eight thousand, four hundred twenty".