128268720 has 60 divisors (see below), whose sum is σ = 430771536. Its totient is φ = 34204800.

The previous prime is 128268719. The next prime is 128268737. The reversal of 128268720 is 27862821.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88356 + ... + 89795.

Almost surely, 2^128268720 is an apocalyptic number.

128268720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128268720 is an abundant number, since it is smaller than the sum of its proper divisors (302502816).

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

128268720 is a wasteful number, since it uses less digits than its factorization.

128268720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178170 (or 178161 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 128268720 is about 11325.5781309388. The cubic root of 128268720 is about 504.3208463484.

The spelling of 128268720 in words is "one hundred twenty-eight million, two hundred sixty-eight thousand, seven hundred twenty".