471644613640 has 64 divisors (see below), whose sum is σ = 1091721414960. Its totient is φ = 183249100800.

The previous prime is 471644613637. The next prime is 471644613667. The reversal of 471644613640 is 46316446174.

It can be written as a sum of positive squares in 8 ways, for example, as 420471839844 + 51172773796 = 648438^2 + 226214^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 608940 + ... + 1146340.

Almost surely, 2^471644613640 is an apocalyptic number.

471644613640 is a gapful number since it is divisible by the number (40) 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 471644613640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (545860707480).

471644613640 is an abundant number, since it is smaller than the sum of its proper divisors (620076801320).

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

471644613640 is a wasteful number, since it uses less digits than its factorization.

471644613640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538042 (or 538038 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 46.

The spelling of 471644613640 in words is "four hundred seventy-one billion, six hundred forty-four million, six hundred thirteen thousand, six hundred forty".