128494081 has 8 divisors (see below), whose sum is σ = 132935400. Its totient is φ = 124103808.

The previous prime is 128494073. The next prime is 128494103. The reversal of 128494081 is 180494821.

It can be written as a sum of positive squares in 4 ways, for example, as 41165056 + 87329025 = 6416^2 + 9345^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128494081 - 2³ = 128494073 is a prime.

It is a super-2 number, since 2×128494081² = 33021457704069122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128494081.

It is not an unprimeable number, because it can be changed into a prime (128494061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7606 + ... + 17743.

It is an arithmetic number, because the mean of its divisors is an integer number (16616925).

Almost surely, 2^128494081 is an apocalyptic number.

It is an amenable number.

128494081 is a deficient number, since it is larger than the sum of its proper divisors (4441319).

128494081 is a wasteful number, since it uses less digits than its factorization.

128494081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25523.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 128494081 is about 11335.5229698501. The cubic root of 128494081 is about 504.6160280933.

It can be divided in two parts, 128 and 494081, that added together give a square (494209 = 703²).

The spelling of 128494081 in words is "one hundred twenty-eight million, four hundred ninety-four thousand, eighty-one".