2158614640 has 120 divisors (see below), whose sum is σ = 6287410080. Its totient is φ = 683149824.

The previous prime is 2158614631. The next prime is 2158614641. The reversal of 2158614640 is 464168512.

It is a self number, because there is not a number n which added to its sum of digits gives 2158614640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158614641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29781 + ... + 72139.

It is an arithmetic number, because the mean of its divisors is an integer number (52395084).

Almost surely, 2^2158614640 is an apocalyptic number.

2158614640 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 2158614640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3143705040).

2158614640 is an abundant number, since it is smaller than the sum of its proper divisors (4128795440).

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

2158614640 is a wasteful number, since it uses less digits than its factorization.

2158614640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42399 (or 42386 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 2158614640 is about 46460.8936633810. The cubic root of 2158614640 is about 1292.3843968004.

The spelling of 2158614640 in words is "two billion, one hundred fifty-eight million, six hundred fourteen thousand, six hundred forty".