18890554840 has 64 divisors (see below), whose sum is σ = 43595496000. Its totient is φ = 7362600960.

The previous prime is 18890554817. The next prime is 18890554841. The reversal of 18890554840 is 4845509881.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18890554841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1369096 + ... + 1382824.

It is an arithmetic number, because the mean of its divisors is an integer number (681179625).

Almost surely, 2^18890554840 is an apocalyptic number.

18890554840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18890554840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21797748000).

18890554840 is an abundant number, since it is smaller than the sum of its proper divisors (24704941160).

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

18890554840 is a wasteful number, since it uses less digits than its factorization.

18890554840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14620 (or 14616 counting only the distinct ones).

The product of its (nonzero) digits is 1843200, while the sum is 52.

The spelling of 18890554840 in words is "eighteen billion, eight hundred ninety million, five hundred fifty-four thousand, eight hundred forty".