643501470 has 64 divisors (see below), whose sum is σ = 1561568256. Its totient is φ = 169706880.

The previous prime is 643501451. The next prime is 643501477. The reversal of 643501470 is 74105346.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643501477) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1753227 + ... + 1753593.

It is an arithmetic number, because the mean of its divisors is an integer number (24399504).

Almost surely, 2^643501470 is an apocalyptic number.

643501470 is an abundant number, since it is smaller than the sum of its proper divisors (918066786).

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

643501470 is a wasteful number, since it uses less digits than its factorization.

643501470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 643501470 is about 25367.3307622225. The cubic root of 643501470 is about 863.3426203474.

The spelling of 643501470 in words is "six hundred forty-three million, five hundred one thousand, four hundred seventy".