2818999920 has 120 divisors (see below), whose sum is σ = 9605666448. Its totient is φ = 683386880.

The previous prime is 2818999907. The next prime is 2818999921. The reversal of 2818999920 is 299998182.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2818999921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19497 + ... + 77576.

Almost surely, 2^2818999920 is an apocalyptic number.

2818999920 is a gapful number since it is divisible by the number (20) 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 2818999920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4802833224).

2818999920 is an abundant number, since it is smaller than the sum of its proper divisors (6786666528).

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

2818999920 is a wasteful number, since it uses less digits than its factorization.

2818999920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97111 (or 97094 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 57.

The square root of 2818999920 is about 53094.2550564560. The cubic root of 2818999920 is about 1412.6406127279.

The spelling of 2818999920 in words is "two billion, eight hundred eighteen million, nine hundred ninety-nine thousand, nine hundred twenty".