28481781994 has 16 divisors (see below), whose sum is σ = 43513585920. Its totient is φ = 13979337840.

The previous prime is 28481781959. The next prime is 28481782001. The reversal of 28481781994 is 49918718482.

It is a super-2 number, since 2×28481781994² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 493662 + ... + 548329.

It is an arithmetic number, because the mean of its divisors is an integer number (2719599120).

Almost surely, 2^28481781994 is an apocalyptic number.

28481781994 is a deficient number, since it is larger than the sum of its proper divisors (15031803926).

28481781994 is a wasteful number, since it uses less digits than its factorization.

28481781994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042245.

The product of its digits is 9289728, while the sum is 61.

The spelling of 28481781994 in words is "twenty-eight billion, four hundred eighty-one million, seven hundred eighty-one thousand, nine hundred ninety-four".