128967720 has 64 divisors (see below), whose sum is σ = 442177920. Its totient is φ = 29478144.

The previous prime is 128967701. The next prime is 128967731. The reversal of 128967720 is 27769821.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75927 + ... + 77606.

It is an arithmetic number, because the mean of its divisors is an integer number (6909030).

Almost surely, 2^128967720 is an apocalyptic number.

128967720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128967720 is an abundant number, since it is smaller than the sum of its proper divisors (313210200).

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

128967720 is a wasteful number, since it uses less digits than its factorization.

128967720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153554 (or 153550 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 128967720 is about 11356.3955549285. The cubic root of 128967720 is about 505.2352855833.

The spelling of 128967720 in words is "one hundred twenty-eight million, nine hundred sixty-seven thousand, seven hundred twenty".