128320995 has 32 divisors (see below), whose sum is σ = 230042880. Its totient is φ = 60531840.

The previous prime is 128320991. The next prime is 128320999. The reversal of 128320995 is 599023821.

It is an interprime number because it is at equal distance from previous prime (128320991) and next prime (128320999).

It is not a de Polignac number, because 128320995 - 2² = 128320991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128320991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4405 + ... + 16614.

It is an arithmetic number, because the mean of its divisors is an integer number (7188840).

Almost surely, 2^128320995 is an apocalyptic number.

128320995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128320995 is a deficient number, since it is larger than the sum of its proper divisors (101721885).

128320995 is a wasteful number, since it uses less digits than its factorization.

128320995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21075.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 128320995 is about 11327.8857250592. The cubic root of 128320995 is about 504.3893478289.

It can be divided in two parts, 128 and 320995, that added together give a palindrome (321123).

The spelling of 128320995 in words is "one hundred twenty-eight million, three hundred twenty thousand, nine hundred ninety-five".