18828864240 has 40 divisors (see below), whose sum is σ = 58369479888. Its totient is φ = 5021030400.

The previous prime is 18828864239. The next prime is 18828864259. The reversal of 18828864240 is 4246882881.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×18828864240² (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, 39226561 + ... + 39227040.

Almost surely, 2^18828864240 is an apocalyptic number.

18828864240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18828864240 is an abundant number, since it is smaller than the sum of its proper divisors (39540615648).

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

18828864240 is a wasteful number, since it uses less digits than its factorization.

18828864240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78453617 (or 78453611 counting only the distinct ones).

The product of its (nonzero) digits is 1572864, while the sum is 51.

The spelling of 18828864240 in words is "eighteen billion, eight hundred twenty-eight million, eight hundred sixty-four thousand, two hundred forty".