643334472 has 96 divisors (see below), whose sum is σ = 1983458880. Its totient is φ = 186468480.

The previous prime is 643334467. The next prime is 643334507. The reversal of 643334472 is 274433346.

643334472 is a `hidden beast` number, since 643 + 3 + 3 + 4 + 4 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 558 + ... + 35874.

It is an arithmetic number, because the mean of its divisors is an integer number (20661030).

Almost surely, 2^643334472 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 643334472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (991729440).

643334472 is an abundant number, since it is smaller than the sum of its proper divisors (1340124408).

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

643334472 is a wasteful number, since it uses less digits than its factorization.

643334472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35363 (or 35356 counting only the distinct ones).

The product of its digits is 145152, while the sum is 36.

The square root of 643334472 is about 25364.0389528166. The cubic root of 643334472 is about 863.2679305596.

The spelling of 643334472 in words is "six hundred forty-three million, three hundred thirty-four thousand, four hundred seventy-two".