128502642 has 8 divisors (see below), whose sum is σ = 257005296. Its totient is φ = 42834212.

The previous prime is 128502641. The next prime is 128502667. The reversal of 128502642 is 246205821.

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

128502642 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (128502641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10708548 + ... + 10708559.

It is an arithmetic number, because the mean of its divisors is an integer number (32125662).

Almost surely, 2^128502642 is an apocalyptic number.

128502642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128502642 is a wasteful number, since it uses less digits than its factorization.

128502642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21417112.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 128502642 is about 11335.9005817800. The cubic root of 128502642 is about 504.6272346325.

The spelling of 128502642 in words is "one hundred twenty-eight million, five hundred two thousand, six hundred forty-two".