28785965381 has 8 divisors (see below), whose sum is σ = 28842657984. Its totient is φ = 28729303200.

The previous prime is 28785965317. The next prime is 28785965387. The reversal of 28785965381 is 18356958782.

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 28785965381 - 2⁶ = 28785965317 is a prime.

It is a super-2 number, since 2×28785965381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28785965387) 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, 2980346 + ... + 2989988.

It is an arithmetic number, because the mean of its divisors is an integer number (3605332248).

Almost surely, 2^28785965381 is an apocalyptic number.

It is an amenable number.

28785965381 is a deficient number, since it is larger than the sum of its proper divisors (56692603).

28785965381 is an equidigital number, since it uses as much as digits as its factorization.

28785965381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15211.

The product of its digits is 29030400, while the sum is 62.

The spelling of 28785965381 in words is "twenty-eight billion, seven hundred eighty-five million, nine hundred sixty-five thousand, three hundred eighty-one".