128571890 has 16 divisors (see below), whose sum is σ = 231959808. Its totient is φ = 51310896.

The previous prime is 128571887. The next prime is 128571893. The reversal of 128571890 is 98175821.

It is an interprime number because it is at equal distance from previous prime (128571887) and next prime (128571893).

It is not an unprimeable number, because it can be changed into a prime (128571893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10082 + ... + 18941.

It is an arithmetic number, because the mean of its divisors is an integer number (14497488).

Almost surely, 2^128571890 is an apocalyptic number.

128571890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128571890 is a deficient number, since it is larger than the sum of its proper divisors (103387918).

128571890 is a wasteful number, since it uses less digits than its factorization.

128571890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29473.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 128571890 is about 11338.9545373460. The cubic root of 128571890 is about 504.7178635127.

The spelling of 128571890 in words is "one hundred twenty-eight million, five hundred seventy-one thousand, eight hundred ninety".