128164440 has 32 divisors (see below), whose sum is σ = 384493680. Its totient is φ = 34177152.

The previous prime is 128164433. The next prime is 128164469. The reversal of 128164440 is 44461821.

It is a super-2 number, since 2×128164440² = 32852247361027200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 128164398 and 128164407.

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 in 7 ways as a sum of consecutive naturals, for example, 533899 + ... + 534138.

Almost surely, 2^128164440 is an apocalyptic number.

128164440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128164440 is an abundant number, since it is smaller than the sum of its proper divisors (256329240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128164440 is a wasteful number, since it uses less digits than its factorization.

128164440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068051 (or 1068047 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 128164440 is about 11320.9734563773. The cubic root of 128164440 is about 504.1841415825.

The spelling of 128164440 in words is "one hundred twenty-eight million, one hundred sixty-four thousand, four hundred forty".