128720079 has 24 divisors (see below), whose sum is σ = 196560000. Its totient is φ = 80946000.

The previous prime is 128720063. The next prime is 128720083. The reversal of 128720079 is 970027821.

It is not a de Polignac number, because 128720079 - 2⁴ = 128720063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128720099) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41422 + ... + 44420.

It is an arithmetic number, because the mean of its divisors is an integer number (8190000).

Almost surely, 2^128720079 is an apocalyptic number.

128720079 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

128720079 is a deficient number, since it is larger than the sum of its proper divisors (67839921).

128720079 is a wasteful number, since it uses less digits than its factorization.

128720079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3275 (or 3272 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 128720079 is about 11345.4871645073. The cubic root of 128720079 is about 504.9116977915.

The spelling of 128720079 in words is "one hundred twenty-eight million, seven hundred twenty thousand, seventy-nine".