128890444 has 6 divisors (see below), whose sum is σ = 225558284. Its totient is φ = 64445220.

The previous prime is 128890441. The next prime is 128890453. The reversal of 128890444 is 444098821.

It is a happy number.

It is a super-2 number, since 2×128890444² = 33225493109034272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128890397 and 128890406.

It is not an unprimeable number, because it can be changed into a prime (128890441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16111302 + ... + 16111309.

Almost surely, 2^128890444 is an apocalyptic number.

It is an amenable number.

128890444 is a deficient number, since it is larger than the sum of its proper divisors (96667840).

128890444 is a wasteful number, since it uses less digits than its factorization.

128890444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32222615 (or 32222613 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 128890444 is about 11352.9927331959. The cubic root of 128890444 is about 505.1343549978.

The spelling of 128890444 in words is "one hundred twenty-eight million, eight hundred ninety thousand, four hundred forty-four".