643476620 has 24 divisors (see below), whose sum is σ = 1387824144. Its totient is φ = 250433856.

The previous prime is 643476611. The next prime is 643476623. The reversal of 643476620 is 26674346.

It is not an unprimeable number, because it can be changed into a prime (643476623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 434042 + ... + 435521.

It is an arithmetic number, because the mean of its divisors is an integer number (57826006).

Almost surely, 2^643476620 is an apocalyptic number.

It is an amenable number.

643476620 is an abundant number, since it is smaller than the sum of its proper divisors (744347524).

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

643476620 is a wasteful number, since it uses less digits than its factorization.

643476620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869609 (or 869607 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 38.

The square root of 643476620 is about 25366.8409542852. The cubic root of 643476620 is about 863.3315070134.

The spelling of 643476620 in words is "six hundred forty-three million, four hundred seventy-six thousand, six hundred twenty".