643787346 has 16 divisors (see below), whose sum is σ = 1322374464. Its totient is φ = 208795824.

The previous prime is 643787321. The next prime is 643787359.

643787346 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 643787295 and 643787304.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1449750 + ... + 1450193.

It is an arithmetic number, because the mean of its divisors is an integer number (82648404).

Almost surely, 2^643787346 is an apocalyptic number.

643787346 is an abundant number, since it is smaller than the sum of its proper divisors (678587118).

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

643787346 is a wasteful number, since it uses less digits than its factorization.

643787346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2899985.

The product of its digits is 2032128, while the sum is 48.

The square root of 643787346 is about 25372.9648642014. The cubic root of 643787346 is about 863.4704482841.

The spelling of 643787346 in words is "six hundred forty-three million, seven hundred eighty-seven thousand, three hundred forty-six".