18916220928 has 224 divisors, whose sum is σ = 55487255040. Its totient is φ = 5684264960.

The previous prime is 18916220879. The next prime is 18916220951. The reversal of 18916220928 is 82902261981.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 45145903 + ... + 45146321.

It is an arithmetic number, because the mean of its divisors is an integer number (247710960).

Almost surely, 2^18916220928 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 18916220928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27743627520).

18916220928 is an abundant number, since it is smaller than the sum of its proper divisors (36571034112).

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

18916220928 is a wasteful number, since it uses less digits than its factorization.

18916220928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626 (or 602 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 48.

The spelling of 18916220928 in words is "eighteen billion, nine hundred sixteen million, two hundred twenty thousand, nine hundred twenty-eight".