28818156381 has 16 divisors (see below), whose sum is σ = 44348170368. Its totient is φ = 16304472000.

The previous prime is 28818156377. The next prime is 28818156391. The reversal of 28818156381 is 18365181882.

It is not a de Polignac number, because 28818156381 - 2² = 28818156377 is a prime.

It is a super-2 number, since 2×28818156381² (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 (28818156371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6791410 + ... + 6795651.

It is an arithmetic number, because the mean of its divisors is an integer number (2771760648).

Almost surely, 2^28818156381 is an apocalyptic number.

28818156381 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28818156381 is a deficient number, since it is larger than the sum of its proper divisors (15530013987).

28818156381 is a wasteful number, since it uses less digits than its factorization.

28818156381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13587172.

The product of its digits is 737280, while the sum is 51.

The spelling of 28818156381 in words is "twenty-eight billion, eight hundred eighteen million, one hundred fifty-six thousand, three hundred eighty-one".