18896221890 has 192 divisors, whose sum is σ = 62708196096. Its totient is φ = 3986848512.

The previous prime is 18896221879. The next prime is 18896221891. The reversal of 18896221890 is 9812269881.

18896221890 is a `hidden beast` number, since 1 + 8 + 8 + 9 + 622 + 1 + 8 + 9 + 0 = 666.

It is a super-2 number, since 2×18896221890² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (18896221891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 178404 + ... + 263856.

It is an arithmetic number, because the mean of its divisors is an integer number (326605188).

Almost surely, 2^18896221890 is an apocalyptic number.

18896221890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18896221890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31354098048).

18896221890 is an abundant number, since it is smaller than the sum of its proper divisors (43811974206).

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

18896221890 is a wasteful number, since it uses less digits than its factorization.

18896221890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85495 (or 85483 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 54.

The spelling of 18896221890 in words is "eighteen billion, eight hundred ninety-six million, two hundred twenty-one thousand, eight hundred ninety".