128620072 has 16 divisors (see below), whose sum is σ = 275614560. Its totient is φ = 55122864.

The previous prime is 128620069. The next prime is 128620073. The reversal of 128620072 is 270026821.

It is a super-3 number, since 3×128620072³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 128620072.

It is not an unprimeable number, because it can be changed into a prime (128620073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1148338 + ... + 1148449.

It is an arithmetic number, because the mean of its divisors is an integer number (17225910).

Almost surely, 2^128620072 is an apocalyptic number.

It is an amenable number.

128620072 is an abundant number, since it is smaller than the sum of its proper divisors (146994488).

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

128620072 is a wasteful number, since it uses less digits than its factorization.

128620072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2296800 (or 2296796 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 128620072 is about 11341.0789610160. The cubic root of 128620072 is about 504.7809028986.

Adding to 128620072 its reverse (270026821), we get a palindrome (398646893).

The spelling of 128620072 in words is "one hundred twenty-eight million, six hundred twenty thousand, seventy-two".