28440678793 has 8 divisors (see below), whose sum is σ = 28979918856. Its totient is φ = 27901536000.

The previous prime is 28440678757. The next prime is 28440678803. The reversal of 28440678793 is 39787604482.

It can be written as a sum of positive squares in 4 ways, for example, as 22176272889 + 6264405904 = 148917^2 + 79148^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28440678793 - 2²¹ = 28438581641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28440678703) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 884193 + ... + 915793.

It is an arithmetic number, because the mean of its divisors is an integer number (3622489857).

Almost surely, 2^28440678793 is an apocalyptic number.

It is an amenable number.

28440678793 is a deficient number, since it is larger than the sum of its proper divisors (539240063).

28440678793 is a wasteful number, since it uses less digits than its factorization.

28440678793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48635.

The product of its (nonzero) digits is 16257024, while the sum is 58.

The spelling of 28440678793 in words is "twenty-eight billion, four hundred forty million, six hundred seventy-eight thousand, seven hundred ninety-three".