18227571390 has 96 divisors (see below), whose sum is σ = 54301890240. Its totient is φ = 4155535872.

The previous prime is 18227571361. The next prime is 18227571391. The reversal of 18227571390 is 9317572281.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18227571391) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 207882 + ... + 282258.

It is an arithmetic number, because the mean of its divisors is an integer number (565644690).

Almost surely, 2^18227571390 is an apocalyptic number.

18227571390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18227571390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27150945120).

18227571390 is an abundant number, since it is smaller than the sum of its proper divisors (36074318850).

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

18227571390 is a wasteful number, since it uses less digits than its factorization.

18227571390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74786 (or 74783 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The spelling of 18227571390 in words is "eighteen billion, two hundred twenty-seven million, five hundred seventy-one thousand, three hundred ninety".