18818213428 has 24 divisors (see below), whose sum is σ = 38404520000. Its totient is φ = 8064948024.

The previous prime is 18818213399. The next prime is 18818213437. The reversal of 18818213428 is 82431281881.

It is a super-2 number, since 2×18818213428² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6856578 + ... + 6859321.

Almost surely, 2^18818213428 is an apocalyptic number.

It is an amenable number.

18818213428 is an abundant number, since it is smaller than the sum of its proper divisors (19586306572).

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

18818213428 is a wasteful number, since it uses less digits than its factorization.

18818213428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13715924 (or 13715908 counting only the distinct ones).

The product of its digits is 196608, while the sum is 46.

The spelling of 18818213428 in words is "eighteen billion, eight hundred eighteen million, two hundred thirteen thousand, four hundred twenty-eight".