28601780143 has 4 divisors (see below), whose sum is σ = 28602124488. Its totient is φ = 28601435800.

The previous prime is 28601780107. The next prime is 28601780159. The reversal of 28601780143 is 34108710682.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28601780143 - 2²⁵ = 28568225711 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28601780096 and 28601780105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28601780173) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 37680 + ... + 242122.

It is an arithmetic number, because the mean of its divisors is an integer number (7150531122).

Almost surely, 2^28601780143 is an apocalyptic number.

28601780143 is a deficient number, since it is larger than the sum of its proper divisors (344345).

28601780143 is a wasteful number, since it uses less digits than its factorization.

28601780143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344344.

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 28601780143 in words is "twenty-eight billion, six hundred one million, seven hundred eighty thousand, one hundred forty-three".