128042566 has 4 divisors (see below), whose sum is σ = 192063852. Its totient is φ = 64021282.

The previous prime is 128042507. The next prime is 128042573. The reversal of 128042566 is 665240821.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32010640 + ... + 32010643.

It is an arithmetic number, because the mean of its divisors is an integer number (48015963).

Almost surely, 2^128042566 is an apocalyptic number.

128042566 is a deficient number, since it is larger than the sum of its proper divisors (64021286).

128042566 is an equidigital number, since it uses as much as digits as its factorization.

128042566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64021285.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 128042566 is about 11315.5895118195. The cubic root of 128042566 is about 504.0242781410.

The spelling of 128042566 in words is "one hundred twenty-eight million, forty-two thousand, five hundred sixty-six".