28681793450 has 24 divisors (see below), whose sum is σ = 53436957420. Its totient is φ = 11453616000.

The previous prime is 28681793443. The next prime is 28681793489. The reversal of 28681793450 is 5439718682.

It is a Cunningham number, because it is equal to 169357²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 24107841289 + 4573952161 = 155267^2 + 67631^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28681793392 and 28681793401.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 447185 + ... + 507284.

It is a 1-persistent number, because it is pandigital, but 2⋅28681793450 = 57363586900 is not.

Almost surely, 2^28681793450 is an apocalyptic number.

28681793450 is a deficient number, since it is larger than the sum of its proper divisors (24755163970).

28681793450 is a wasteful number, since it uses less digits than its factorization.

28681793450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955082 (or 955077 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 28681793450 in words is "twenty-eight billion, six hundred eighty-one million, seven hundred ninety-three thousand, four hundred fifty".