643347495 has 64 divisors (see below), whose sum is σ = 1349345280. Its totient is φ = 284601600.

The previous prime is 643347487. The next prime is 643347521. The reversal of 643347495 is 594743346.

643347495 is a `hidden beast` number, since 64 + 33 + 474 + 95 = 666.

It is not a de Polignac number, because 643347495 - 2³ = 643347487 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 643347495.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18315 + ... + 40275.

It is an arithmetic number, because the mean of its divisors is an integer number (21083520).

Almost surely, 2^643347495 is an apocalyptic number.

643347495 is an abundant number, since it is smaller than the sum of its proper divisors (705997785).

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

643347495 is a wasteful number, since it uses less digits than its factorization.

643347495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22013 (or 22007 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 45.

The square root of 643347495 is about 25364.2956732490. The cubic root of 643347495 is about 863.2737555557.

The spelling of 643347495 in words is "six hundred forty-three million, three hundred forty-seven thousand, four hundred ninety-five".