2543844864 has 80 divisors (see below), whose sum is σ = 7393098240. Its totient is φ = 770856960.

The previous prime is 2543844859. The next prime is 2543844889. The reversal of 2543844864 is 4684483452.

It is a super-2 number, since 2×2543844864² = 12942293384198356992, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58384 + ... + 92175.

It is an arithmetic number, because the mean of its divisors is an integer number (92413728).

Almost surely, 2^2543844864 is an apocalyptic number.

2543844864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2543844864 is an abundant number, since it is smaller than the sum of its proper divisors (4849253376).

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

2543844864 is a wasteful number, since it uses less digits than its factorization.

2543844864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150591 (or 150575 counting only the distinct ones).

The product of its digits is 2949120, while the sum is 48.

The square root of 2543844864 is about 50436.5429425927. The cubic root of 2543844864 is about 1365.0970897946.

The spelling of 2543844864 in words is "two billion, five hundred forty-three million, eight hundred forty-four thousand, eight hundred sixty-four".