128444650 has 48 divisors (see below), whose sum is σ = 253519488. Its totient is φ = 48312000.

The previous prime is 128444633. The next prime is 128444651. The reversal of 128444650 is 56444821.

It is a super-2 number, since 2×128444650² = 32996056227245000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128444651) 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 23 ways as a sum of consecutive naturals, for example, 69235 + ... + 71065.

It is an arithmetic number, because the mean of its divisors is an integer number (5281656).

Almost surely, 2^128444650 is an apocalyptic number.

128444650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128444650 is a deficient number, since it is larger than the sum of its proper divisors (125074838).

128444650 is a wasteful number, since it uses less digits than its factorization.

128444650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1927 (or 1922 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 34.

The square root of 128444650 is about 11333.3424019572. The cubic root of 128444650 is about 504.5513120795.

The spelling of 128444650 in words is "one hundred twenty-eight million, four hundred forty-four thousand, six hundred fifty".