128834198640 has 180 divisors, whose sum is σ = 503308025064. Its totient is φ = 29447808768.

The previous prime is 128834198611. The next prime is 128834198729. The reversal of 128834198640 is 46891438821.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (180).

It is a super-3 number, since 3×128834198640³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1790602 + ... + 1861161.

Almost surely, 2^128834198640 is an apocalyptic number.

128834198640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128834198640 is an abundant number, since it is smaller than the sum of its proper divisors (374473826424).

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

128834198640 is a wasteful number, since it uses less digits than its factorization.

128834198640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3651796 (or 3651780 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 54.

The spelling of 128834198640 in words is "one hundred twenty-eight billion, eight hundred thirty-four million, one hundred ninety-eight thousand, six hundred forty".