2158486820 has 96 divisors (see below), whose sum is σ = 5490132480. Its totient is φ = 697052160.

The previous prime is 2158486801. The next prime is 2158486843. The reversal of 2158486820 is 286848512.

It is a super-2 number, since 2×2158486820² = 9318130704227424800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159977 + ... + 172943.

It is an arithmetic number, because the mean of its divisors is an integer number (57188880).

Almost surely, 2^2158486820 is an apocalyptic number.

2158486820 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 2158486820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2745066240).

2158486820 is an abundant number, since it is smaller than the sum of its proper divisors (3331645660).

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

2158486820 is a wasteful number, since it uses less digits than its factorization.

2158486820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13053 (or 13051 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 44.

The square root of 2158486820 is about 46459.5180775694. The cubic root of 2158486820 is about 1292.3588872550.

The spelling of 2158486820 in words is "two billion, one hundred fifty-eight million, four hundred eighty-six thousand, eight hundred twenty".