2143578064 has 20 divisors (see below), whose sum is σ = 4221269380. Its totient is φ = 1054218240.

The previous prime is 2143578061. The next prime is 2143578089. The reversal of 2143578064 is 4608753412.

It can be written as a sum of positive squares in 2 ways, for example, as 380250000 + 1763328064 = 19500^2 + 41992^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143578061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1097169 + ... + 1099120.

It is an arithmetic number, because the mean of its divisors is an integer number (211063469).

Almost surely, 2^2143578064 is an apocalyptic number.

It is an amenable number.

2143578064 is a deficient number, since it is larger than the sum of its proper divisors (2077691316).

2143578064 is a wasteful number, since it uses less digits than its factorization.

2143578064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196358 (or 2196352 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 2143578064 is about 46298.7911721246. The cubic root of 2143578064 is about 1289.3765518942.

It can be divided in two parts, 21435 and 78064, that added together give a palindrome (99499).

The spelling of 2143578064 in words is "two billion, one hundred forty-three million, five hundred seventy-eight thousand, sixty-four".