6544273920 has 160 divisors (see below), whose sum is σ = 21126897792. Its totient is φ = 1727987712.

The previous prime is 6544273867. The next prime is 6544273933. The reversal of 6544273920 is 293724456.

It is a tau number, because it is divible by the number of its divisors (160).

It is a super-2 number, since 2×6544273920² = 85655042279984332800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 786904 + ... + 795176.

Almost surely, 2^6544273920 is an apocalyptic number.

6544273920 is a gapful number since it is divisible by the number (60) 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 6544273920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10563448896).

6544273920 is an abundant number, since it is smaller than the sum of its proper divisors (14582623872).

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

6544273920 is a wasteful number, since it uses less digits than its factorization.

6544273920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8402 (or 8386 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 42.

The square root of 6544273920 is about 80896.6867059461. The cubic root of 6544273920 is about 1870.4832479998.

The spelling of 6544273920 in words is "six billion, five hundred forty-four million, two hundred seventy-three thousand, nine hundred twenty".