128458677438 has 240 divisors, whose sum is σ = 366523353504. Its totient is φ = 33322181760.

The previous prime is 128458677407. The next prime is 128458677461. The reversal of 128458677438 is 834776854821.

It is a happy number.

128458677438 is a `hidden beast` number, since 1 + 2 + 8 + 4 + 586 + 7 + 7 + 43 + 8 = 666.

It is a super-3 number, since 3×128458677438³ (a number of 34 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 6284631 + ... + 6305037.

Almost surely, 2^128458677438 is an apocalyptic number.

128458677438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 128458677438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183261676752).

128458677438 is an abundant number, since it is smaller than the sum of its proper divisors (238064676066).

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

128458677438 is a wasteful number, since it uses less digits than its factorization.

128458677438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20509 (or 20493 counting only the distinct ones).

The product of its digits is 72253440, while the sum is 63.

The spelling of 128458677438 in words is "one hundred twenty-eight billion, four hundred fifty-eight million, six hundred seventy-seven thousand, four hundred thirty-eight".