18228748031 has 4 divisors (see below), whose sum is σ = 19630959432. Its totient is φ = 16826536632.

The previous prime is 18228748019. The next prime is 18228748037. The reversal of 18228748031 is 13084782281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18228748031 - 2³⁴ = 1048878847 is a prime.

It is a super-2 number, since 2×18228748031² (a number of 21 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 (18228748037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 701105681 + ... + 701105706.

It is an arithmetic number, because the mean of its divisors is an integer number (4907739858).

Almost surely, 2^18228748031 is an apocalyptic number.

18228748031 is a deficient number, since it is larger than the sum of its proper divisors (1402211401).

18228748031 is a wasteful number, since it uses less digits than its factorization.

18228748031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402211400.

The product of its (nonzero) digits is 172032, while the sum is 44.

The spelling of 18228748031 in words is "eighteen billion, two hundred twenty-eight million, seven hundred forty-eight thousand, thirty-one".