643713488 has 80 divisors (see below), whose sum is σ = 1400386560. Its totient is φ = 284169600.

The previous prime is 643713401. The next prime is 643713491. The reversal of 643713488 is 884317346.

It is a super-2 number, since 2×643713488² = 828734109266252288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

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, 931223 + ... + 931913.

It is an arithmetic number, because the mean of its divisors is an integer number (17504832).

Almost surely, 2^643713488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643713488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (700193280).

643713488 is an abundant number, since it is smaller than the sum of its proper divisors (756673072).

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

643713488 is a wasteful number, since it uses less digits than its factorization.

643713488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856 (or 850 counting only the distinct ones).

The product of its digits is 387072, while the sum is 44.

The square root of 643713488 is about 25371.5093756757. The cubic root of 643713488 is about 863.4374266972.

The spelling of 643713488 in words is "six hundred forty-three million, seven hundred thirteen thousand, four hundred eighty-eight".