643477400 has 48 divisors (see below), whose sum is σ = 1499532000. Its totient is φ = 256798080.

The previous prime is 643477391. The next prime is 643477453. The reversal of 643477400 is 4774346.

643477400 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89126 + ... + 96074.

It is an arithmetic number, because the mean of its divisors is an integer number (31240250).

Almost surely, 2^643477400 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 643477400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (749766000).

643477400 is an abundant number, since it is smaller than the sum of its proper divisors (856054600).

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

643477400 is a wasteful number, since it uses less digits than its factorization.

643477400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7428 (or 7419 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 35.

The square root of 643477400 is about 25366.8563286821. The cubic root of 643477400 is about 863.3318558467.

The spelling of 643477400 in words is "six hundred forty-three million, four hundred seventy-seven thousand, four hundred".