128180642 has 16 divisors (see below), whose sum is σ = 196180152. Its totient is φ = 62795520.

The previous prime is 128180641. The next prime is 128180653. The reversal of 128180642 is 246081821.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 32160241 + 96020401 = 5671^2 + 9799^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128180599 and 128180608.

It is not an unprimeable number, because it can be changed into a prime (128180641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31898 + ... + 35690.

Almost surely, 2^128180642 is an apocalyptic number.

128180642 is a deficient number, since it is larger than the sum of its proper divisors (67999510).

128180642 is a wasteful number, since it uses less digits than its factorization.

128180642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4133.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 128180642 is about 11321.6890082708. The cubic root of 128180642 is about 504.2053862878.

The spelling of 128180642 in words is "one hundred twenty-eight million, one hundred eighty thousand, six hundred forty-two".