128633081 has 12 divisors (see below), whose sum is σ = 133638228. Its totient is φ = 123790464.

The previous prime is 128633077. The next prime is 128633107. The reversal of 128633081 is 180336821.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 63282025 + 65351056 = 7955^2 + 8084^2 .

It is not a de Polignac number, because 128633081 - 2² = 128633077 is a prime.

It is a super-2 number, since 2×128633081² = 33092939055105122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128633051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134501 + ... + 135453.

It is an arithmetic number, because the mean of its divisors is an integer number (11136519).

Almost surely, 2^128633081 is an apocalyptic number.

It is an amenable number.

128633081 is a deficient number, since it is larger than the sum of its proper divisors (5005147).

128633081 is an frugal number, since it uses more digits than its factorization.

128633081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112 (or 1069 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 128633081 is about 11341.6524810100. The cubic root of 128633081 is about 504.7979206504.

The spelling of 128633081 in words is "one hundred twenty-eight million, six hundred thirty-three thousand, eighty-one".