128459720 has 32 divisors (see below), whose sum is σ = 290157120. Its totient is φ = 51184320.

The previous prime is 128459711. The next prime is 128459729. The reversal of 128459720 is 27954821.

It is an interprime number because it is at equal distance from previous prime (128459711) and next prime (128459729).

It is not an unprimeable number, because it can be changed into a prime (128459729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4415 + ... + 16625.

It is an arithmetic number, because the mean of its divisors is an integer number (9067410).

Almost surely, 2^128459720 is an apocalyptic number.

128459720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128459720 is an abundant number, since it is smaller than the sum of its proper divisors (161697400).

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

128459720 is a wasteful number, since it uses less digits than its factorization.

128459720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12485 (or 12481 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 128459720 is about 11334.0072348662. The cubic root of 128459720 is about 504.5710437718.

The spelling of 128459720 in words is "one hundred twenty-eight million, four hundred fifty-nine thousand, seven hundred twenty".