18890740506 has 64 divisors (see below), whose sum is σ = 42871099392. Its totient is φ = 5497440000.

The previous prime is 18890740501. The next prime is 18890740511. The reversal of 18890740506 is 60504709881.

It is an interprime number because it is at equal distance from previous prime (18890740501) and next prime (18890740511).

It is not an unprimeable number, because it can be changed into a prime (18890740501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 232786 + ... + 303266.

It is an arithmetic number, because the mean of its divisors is an integer number (669860928).

Almost surely, 2^18890740506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18890740506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21435549696).

18890740506 is an abundant number, since it is smaller than the sum of its proper divisors (23980358886).

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

18890740506 is a wasteful number, since it uses less digits than its factorization.

18890740506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70659.

The product of its (nonzero) digits is 483840, while the sum is 48.

The spelling of 18890740506 in words is "eighteen billion, eight hundred ninety million, seven hundred forty thousand, five hundred six".