643315740 has 48 divisors (see below), whose sum is σ = 1805424768. Its totient is φ = 171156544.

The previous prime is 643315721. The next prime is 643315747. The reversal of 643315740 is 47513346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643315747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14479 + ... + 38681.

It is an arithmetic number, because the mean of its divisors is an integer number (37613016).

Almost surely, 2^643315740 is an apocalyptic number.

643315740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

643315740 is an abundant number, since it is smaller than the sum of its proper divisors (1162109028).

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

643315740 is a wasteful number, since it uses less digits than its factorization.

643315740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24658 (or 24656 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 643315740 is about 25363.6696871726. The cubic root of 643315740 is about 863.2595518740.

The spelling of 643315740 in words is "six hundred forty-three million, three hundred fifteen thousand, seven hundred forty".