128731082 has 4 divisors (see below), whose sum is σ = 193096626. Its totient is φ = 64365540.

The previous prime is 128731081. The next prime is 128731171. The reversal of 128731082 is 280137821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 280137821 = 509 ⋅550369.

It can be written as a sum of positive squares in only one way, i.e., 70040161 + 58690921 = 8369^2 + 7661^2 .

It is not an unprimeable number, because it can be changed into a prime (128731081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32182769 + ... + 32182772.

Almost surely, 2^128731082 is an apocalyptic number.

128731082 is a deficient number, since it is larger than the sum of its proper divisors (64365544).

128731082 is an equidigital number, since it uses as much as digits as its factorization.

128731082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64365543.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 128731082 is about 11345.9720606037. The cubic root of 128731082 is about 504.9260840089.

The spelling of 128731082 in words is "one hundred twenty-eight million, seven hundred thirty-one thousand, eighty-two".