128442646 has 16 divisors (see below), whose sum is σ = 196376400. Its totient is φ = 62988928.

The previous prime is 128442631. The next prime is 128442659. The reversal of 128442646 is 646244821.

It is a happy number.

It is a super-2 number, since 2×128442646² = 32995026622962632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66186 + ... + 68098.

It is an arithmetic number, because the mean of its divisors is an integer number (12273525).

Almost surely, 2^128442646 is an apocalyptic number.

128442646 is a deficient number, since it is larger than the sum of its proper divisors (67933754).

128442646 is a wasteful number, since it uses less digits than its factorization.

128442646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2543.

The product of its digits is 73728, while the sum is 37.

The square root of 128442646 is about 11333.2539899183. The cubic root of 128442646 is about 504.5486880541.

The spelling of 128442646 in words is "one hundred twenty-eight million, four hundred forty-two thousand, six hundred forty-six".