18409619264 has 56 divisors (see below), whose sum is σ = 37717951488. Its totient is φ = 8909429760.

The previous prime is 18409619237. The next prime is 18409619273. The reversal of 18409619264 is 46291690481.

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, 305627 + ... + 360869.

It is an arithmetic number, because the mean of its divisors is an integer number (673534848).

Almost surely, 2^18409619264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18409619264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18858975744).

18409619264 is an abundant number, since it is smaller than the sum of its proper divisors (19308332224).

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

18409619264 is a wasteful number, since it uses less digits than its factorization.

18409619264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55423 (or 55413 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 18409619264 in words is "eighteen billion, four hundred nine million, six hundred nineteen thousand, two hundred sixty-four".