28303613421 has 4 divisors (see below), whose sum is σ = 37738151232. Its totient is φ = 18869075612.

The previous prime is 28303613417. The next prime is 28303613461. The reversal of 28303613421 is 12431630382.

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 28303613421 - 2² = 28303613417 is a prime.

It is a super-2 number, since 2×28303613421² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28303613411) 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, 4717268901 + ... + 4717268906.

It is an arithmetic number, because the mean of its divisors is an integer number (9434537808).

Almost surely, 2^28303613421 is an apocalyptic number.

It is an amenable number.

28303613421 is a deficient number, since it is larger than the sum of its proper divisors (9434537811).

28303613421 is an equidigital number, since it uses as much as digits as its factorization.

28303613421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9434537810.

The product of its (nonzero) digits is 20736, while the sum is 33.

The spelling of 28303613421 in words is "twenty-eight billion, three hundred three million, six hundred thirteen thousand, four hundred twenty-one".