643354074 has 24 divisors (see below), whose sum is σ = 1520655552. Its totient is φ = 194955720.

The previous prime is 643354051. The next prime is 643354081. The reversal of 643354074 is 470453346.

It is a happy number.

643354074 is a `hidden beast` number, since 6 + 43 + 3 + 540 + 74 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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, 1624434 + ... + 1624829.

It is an arithmetic number, because the mean of its divisors is an integer number (63360648).

Almost surely, 2^643354074 is an apocalyptic number.

643354074 is an abundant number, since it is smaller than the sum of its proper divisors (877301478).

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

643354074 is a wasteful number, since it uses less digits than its factorization.

643354074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3249282 (or 3249279 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 36.

The square root of 643354074 is about 25364.4253630947. The cubic root of 643354074 is about 863.2766982156.

The spelling of 643354074 in words is "six hundred forty-three million, three hundred fifty-four thousand, seventy-four".