18510135228 has 168 divisors, whose sum is σ = 55381365648. Its totient is φ = 5360214528.

The previous prime is 18510135221. The next prime is 18510135229. The reversal of 18510135228 is 82253101581.

18510135228 is a `hidden beast` number, since 1 + 8 + 510 + 135 + 2 + 2 + 8 = 666.

It is a super-2 number, since 2×18510135228² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18510135192 and 18510135201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18510135221) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 630075 + ... + 658797.

It is an arithmetic number, because the mean of its divisors is an integer number (329650986).

Almost surely, 2^18510135228 is an apocalyptic number.

18510135228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18510135228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27690682824).

18510135228 is an abundant number, since it is smaller than the sum of its proper divisors (36871230420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18510135228 is a wasteful number, since it uses less digits than its factorization.

18510135228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28775 (or 28758 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The spelling of 18510135228 in words is "eighteen billion, five hundred ten million, one hundred thirty-five thousand, two hundred twenty-eight".