128802538 has 4 divisors (see below), whose sum is σ = 193203810. Its totient is φ = 64401268.

The previous prime is 128802533. The next prime is 128802571. The reversal of 128802538 is 835208821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 97476129 + 31326409 = 9873^2 + 5597^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128802497 and 128802506.

It is not an unprimeable number, because it can be changed into a prime (128802533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32200633 + ... + 32200636.

Almost surely, 2^128802538 is an apocalyptic number.

128802538 is a deficient number, since it is larger than the sum of its proper divisors (64401272).

128802538 is an equidigital number, since it uses as much as digits as its factorization.

128802538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64401271.

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 128802538 is about 11349.1205826707. The cubic root of 128802538 is about 505.0194914543.

The spelling of 128802538 in words is "one hundred twenty-eight million, eight hundred two thousand, five hundred thirty-eight".