128680802 has 4 divisors (see below), whose sum is σ = 193021206. Its totient is φ = 64340400.

The previous prime is 128680771. The next prime is 128680817. The reversal of 128680802 is 208086821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 208086821 = 487 ⋅427283.

It can be written as a sum of positive squares in only one way, i.e., 124523281 + 4157521 = 11159^2 + 2039^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32170199 + ... + 32170202.

Almost surely, 2^128680802 is an apocalyptic number.

128680802 is a deficient number, since it is larger than the sum of its proper divisors (64340404).

128680802 is an equidigital number, since it uses as much as digits as its factorization.

128680802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64340403.

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 128680802 is about 11343.7560798882. The cubic root of 128680802 is about 504.8603371585.

The spelling of 128680802 in words is "one hundred twenty-eight million, six hundred eighty thousand, eight hundred two".