128928957720 has 32 divisors (see below), whose sum is σ = 386786873520. Its totient is φ = 34381055360.

The previous prime is 128928957719. The next prime is 128928957737. The reversal of 128928957720 is 27759829821.

It is a super-2 number, since 2×128928957720² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 537203871 + ... + 537204110.

Almost surely, 2^128928957720 is an apocalyptic number.

128928957720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128928957720 is an abundant number, since it is smaller than the sum of its proper divisors (257857915800).

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

128928957720 is a wasteful number, since it uses less digits than its factorization.

128928957720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074407995 (or 1074407991 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 60.

The spelling of 128928957720 in words is "one hundred twenty-eight billion, nine hundred twenty-eight million, nine hundred fifty-seven thousand, seven hundred twenty".