128905861446 has 24 divisors (see below), whose sum is σ = 279566447160. Its totient is φ = 42927018336.

The previous prime is 128905861417. The next prime is 128905861453. The reversal of 128905861446 is 644168509821.

128905861446 is a `hidden beast` number, since 1 + 2 + 8 + 9 + 0 + 586 + 14 + 46 = 666.

It is a super-2 number, since 2×128905861446² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128905861392 and 128905861401.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3447736 + ... + 3484923.

It is an arithmetic number, because the mean of its divisors is an integer number (11648601965).

Almost surely, 2^128905861446 is an apocalyptic number.

128905861446 is an abundant number, since it is smaller than the sum of its proper divisors (150660585714).

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

128905861446 is a wasteful number, since it uses less digits than its factorization.

128905861446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6933700 (or 6933697 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 128905861446 in words is "one hundred twenty-eight billion, nine hundred five million, eight hundred sixty-one thousand, four hundred forty-six".