28321809951 has 8 divisors (see below), whose sum is σ = 38783019184. Its totient is φ = 18370903680.

The previous prime is 28321809941. The next prime is 28321809953. The reversal of 28321809951 is 15990812382.

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

It is not a de Polignac number, because 28321809951 - 2¹¹ = 28321807903 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28321809951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28321809953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127575610 + ... + 127575831.

It is an arithmetic number, because the mean of its divisors is an integer number (4847877398).

Almost surely, 2^28321809951 is an apocalyptic number.

28321809951 is a deficient number, since it is larger than the sum of its proper divisors (10461209233).

28321809951 is a wasteful number, since it uses less digits than its factorization.

28321809951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255151481.

The product of its (nonzero) digits is 311040, while the sum is 48.

The spelling of 28321809951 in words is "twenty-eight billion, three hundred twenty-one million, eight hundred nine thousand, nine hundred fifty-one".