28045638381 has 8 divisors (see below), whose sum is σ = 37398150144. Its totient is φ = 18695109440.

The previous prime is 28045638347. The next prime is 28045638457. The reversal of 28045638381 is 18383654082.

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 28045638381 - 2¹³ = 28045630189 is a prime.

It is a super-2 number, since 2×28045638381² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28045638381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28045638281) 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, 462381 + ... + 519506.

It is an arithmetic number, because the mean of its divisors is an integer number (4674768768).

Almost surely, 2^28045638381 is an apocalyptic number.

It is an amenable number.

28045638381 is a deficient number, since it is larger than the sum of its proper divisors (9352511763).

28045638381 is an equidigital number, since it uses as much as digits as its factorization.

28045638381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991411.

The product of its (nonzero) digits is 1105920, while the sum is 48.

The spelling of 28045638381 in words is "twenty-eight billion, forty-five million, six hundred thirty-eight thousand, three hundred eighty-one".