28178950733 has 4 divisors (see below), whose sum is σ = 29404122528. Its totient is φ = 26953778940.

The previous prime is 28178950703. The next prime is 28178950747. The reversal of 28178950733 is 33705987182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28178950733 - 2¹² = 28178946637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28178950703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 612585863 + ... + 612585908.

It is an arithmetic number, because the mean of its divisors is an integer number (7351030632).

Almost surely, 2^28178950733 is an apocalyptic number.

28178950733 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28178950733 is a deficient number, since it is larger than the sum of its proper divisors (1225171795).

28178950733 is a wasteful number, since it uses less digits than its factorization.

28178950733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225171794.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 28178950733 in words is "twenty-eight billion, one hundred seventy-eight million, nine hundred fifty thousand, seven hundred thirty-three".