2158686720 has 160 divisors (see below), whose sum is σ = 7668080640. Its totient is φ = 575631360.

The previous prime is 2158686713. The next prime is 2158686763. The reversal of 2158686720 is 276868512.

2158686720 is a `hidden beast` number, since 2 + 1 + 586 + 8 + 67 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53505 + ... + 84735.

It is an arithmetic number, because the mean of its divisors is an integer number (47925504).

Almost surely, 2^2158686720 is an apocalyptic number.

2158686720 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 2158686720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3834040320).

2158686720 is an abundant number, since it is smaller than the sum of its proper divisors (5509393920).

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

2158686720 is an equidigital number, since it uses as much as digits as its factorization.

2158686720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31263 (or 31241 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 2158686720 is about 46461.6693630352. The cubic root of 2158686720 is about 1292.3987816484.

The spelling of 2158686720 in words is "two billion, one hundred fifty-eight million, six hundred eighty-six thousand, seven hundred twenty".