2158978560 has 80 divisors (see below), whose sum is σ = 6902009136. Its totient is φ = 575725568.

The previous prime is 2158978553. The next prime is 2158978609. The reversal of 2158978560 is 658798512.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×2158978560² = 9322376845079347200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 132879 + ... + 148238.

Almost surely, 2^2158978560 is an apocalyptic number.

2158978560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2158978560 is an abundant number, since it is smaller than the sum of its proper divisors (4743030576).

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

2158978560 is an equidigital number, since it uses as much as digits as its factorization.

2158978560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281143 (or 281127 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 51.

The square root of 2158978560 is about 46464.8099102966. The cubic root of 2158978560 is about 1292.4570202465.

The spelling of 2158978560 in words is "two billion, one hundred fifty-eight million, nine hundred seventy-eight thousand, five hundred sixty".