6644548740 has 24 divisors (see below), whose sum is σ = 18604736640. Its totient is φ = 1771879648.

The previous prime is 6644548733. The next prime is 6644548741. The reversal of 6644548740 is 478454466.

It is a self number, because there is not a number n which added to its sum of digits gives 6644548740.

It is not an unprimeable number, because it can be changed into a prime (6644548741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55371180 + ... + 55371299.

It is an arithmetic number, because the mean of its divisors is an integer number (775197360).

Almost surely, 2^6644548740 is an apocalyptic number.

6644548740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6644548740 is an abundant number, since it is smaller than the sum of its proper divisors (11960187900).

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

6644548740 is a wasteful number, since it uses less digits than its factorization.

6644548740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110742491 (or 110742489 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 48.

The square root of 6644548740 is about 81514.1014794373. The cubic root of 6644548740 is about 1879.9883751356.

The spelling of 6644548740 in words is "six billion, six hundred forty-four million, five hundred forty-eight thousand, seven hundred forty".