28727318642 has 16 divisors (see below), whose sum is σ = 49052181312. Its totient is φ = 12490138320.

The previous prime is 28727318639. The next prime is 28727318647. The reversal of 28727318642 is 24681372782.

It is not an unprimeable number, because it can be changed into a prime (28727318647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28386173 + ... + 28387184.

It is an arithmetic number, because the mean of its divisors is an integer number (3065761332).

Almost surely, 2^28727318642 is an apocalyptic number.

28727318642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28727318642 is a deficient number, since it is larger than the sum of its proper divisors (20324862670).

28727318642 is a wasteful number, since it uses less digits than its factorization.

28727318642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56773393.

The product of its digits is 1806336, while the sum is 50.

The spelling of 28727318642 in words is "twenty-eight billion, seven hundred twenty-seven million, three hundred eighteen thousand, six hundred forty-two".