28128343642 has 32 divisors (see below), whose sum is σ = 49484421504. Its totient is φ = 11739955200.

The previous prime is 28128343637. The next prime is 28128343673. The reversal of 28128343642 is 24634382182.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279642 + ... + 366682.

It is an arithmetic number, because the mean of its divisors is an integer number (1546388172).

Almost surely, 2^28128343642 is an apocalyptic number.

28128343642 is a deficient number, since it is larger than the sum of its proper divisors (21356077862).

28128343642 is a wasteful number, since it uses less digits than its factorization.

28128343642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87654.

The product of its digits is 442368, while the sum is 43.

The spelling of 28128343642 in words is "twenty-eight billion, one hundred twenty-eight million, three hundred forty-three thousand, six hundred forty-two".