2158578450 has 96 divisors (see below), whose sum is σ = 6797838720. Its totient is φ = 493387200.

The previous prime is 2158578449. The next prime is 2158578473. The reversal of 2158578450 is 548758512.

2158578450 is a `hidden beast` number, since 21 + 5 + 8 + 578 + 4 + 50 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 2158578396 and 2158578405.

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 47 ways as a sum of consecutive naturals, for example, 104761 + ... + 123660.

It is an arithmetic number, because the mean of its divisors is an integer number (70810820).

Almost surely, 2^2158578450 is an apocalyptic number.

2158578450 is an abundant number, since it is smaller than the sum of its proper divisors (4639260270).

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

2158578450 is a wasteful number, since it uses less digits than its factorization.

2158578450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228449 (or 228438 counting only the distinct ones).

The product of its (nonzero) digits is 448000, while the sum is 45.

The square root of 2158578450 is about 46460.5041944230. The cubic root of 2158578450 is about 1292.3771743205.

The spelling of 2158578450 in words is "two billion, one hundred fifty-eight million, five hundred seventy-eight thousand, four hundred fifty".