18208719628 has 48 divisors (see below), whose sum is σ = 35809804800. Its totient is φ = 8029828800.

The previous prime is 18208719619. The next prime is 18208719677. The reversal of 18208719628 is 82691780281.

It is a happy number.

It is a super-2 number, since 2×18208719628² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249613 + ... + 314203.

It is an arithmetic number, because the mean of its divisors is an integer number (746037600).

Almost surely, 2^18208719628 is an apocalyptic number.

It is an amenable number.

18208719628 is a deficient number, since it is larger than the sum of its proper divisors (17601085172).

18208719628 is a wasteful number, since it uses less digits than its factorization.

18208719628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64798 (or 64796 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 52.

The spelling of 18208719628 in words is "eighteen billion, two hundred eight million, seven hundred nineteen thousand, six hundred twenty-eight".