643473715 has 16 divisors (see below), whose sum is σ = 836608608. Its totient is φ = 473227776.

The previous prime is 643473707. The next prime is 643473731. The reversal of 643473715 is 517374346.

It is not a de Polignac number, because 643473715 - 2³ = 643473707 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84372 + ... + 91681.

It is an arithmetic number, because the mean of its divisors is an integer number (52288038).

Almost surely, 2^643473715 is an apocalyptic number.

643473715 is a deficient number, since it is larger than the sum of its proper divisors (193134893).

643473715 is a wasteful number, since it uses less digits than its factorization.

643473715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176118.

The product of its digits is 211680, while the sum is 40.

The square root of 643473715 is about 25366.7836944300. The cubic root of 643473715 is about 863.3302078303.

The spelling of 643473715 in words is "six hundred forty-three million, four hundred seventy-three thousand, seven hundred fifteen".