28719920642 has 16 divisors (see below), whose sum is σ = 49239463680. Its totient is φ = 12307208928.

The previous prime is 28719920599. The next prime is 28719920689. The reversal of 28719920642 is 24602991782.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29783 + ... + 241509.

It is an arithmetic number, because the mean of its divisors is an integer number (3077466480).

Almost surely, 2^28719920642 is an apocalyptic number.

28719920642 is a deficient number, since it is larger than the sum of its proper divisors (20519543038).

28719920642 is a wasteful number, since it uses less digits than its factorization.

28719920642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221425.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 28719920642 in words is "twenty-eight billion, seven hundred nineteen million, nine hundred twenty thousand, six hundred forty-two".