18407989646928 has 240 divisors, whose sum is σ = 59993818649856. Its totient is φ = 5159623772160.

The previous prime is 18407989646903. The next prime is 18407989646929. The reversal of 18407989646928 is 82964698970481.

18407989646928 is a `hidden beast` number, since 1 + 8 + 4 + 0 + 79 + 89 + 6 + 469 + 2 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18407989646929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 809949901 + ... + 809972627.

Almost surely, 2^{18407989646928} is an apocalyptic number.

18407989646928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18407989646928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29996909324928).

18407989646928 is an abundant number, since it is smaller than the sum of its proper divisors (41585829002928).

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

18407989646928 is a wasteful number, since it uses less digits than its factorization.

18407989646928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37962 (or 37953 counting only the distinct ones).

The product of its (nonzero) digits is 3009871872, while the sum is 81.

The spelling of 18407989646928 in words is "eighteen trillion, four hundred seven billion, nine hundred eighty-nine million, six hundred forty-six thousand, nine hundred twenty-eight".