28786233381 has 8 divisors (see below), whose sum is σ = 38439713184. Its totient is φ = 19161787920.

The previous prime is 28786233323. The next prime is 28786233383. The reversal of 28786233381 is 18333268782.

It is a happy number.

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

It is not a de Polignac number, because 28786233381 - 2⁶ = 28786233317 is a prime.

It is a super-2 number, since 2×28786233381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28786233383) 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, 7256271 + ... + 7260236.

It is an arithmetic number, because the mean of its divisors is an integer number (4804964148).

Almost surely, 2^28786233381 is an apocalyptic number.

It is an amenable number.

28786233381 is a deficient number, since it is larger than the sum of its proper divisors (9653479803).

28786233381 is a wasteful number, since it uses less digits than its factorization.

28786233381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14517171.

The product of its digits is 2322432, while the sum is 51.

The spelling of 28786233381 in words is "twenty-eight billion, seven hundred eighty-six million, two hundred thirty-three thousand, three hundred eighty-one".