642994443 has 80 divisors (see below), whose sum is σ = 1197563136. Its totient is φ = 334756800.

The previous prime is 642994441. The next prime is 642994487. The reversal of 642994443 is 344499246.

It is not a de Polignac number, because 642994443 - 2¹ = 642994441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642994441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 611268 + ... + 612318.

Almost surely, 2^642994443 is an apocalyptic number.

642994443 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

642994443 is a deficient number, since it is larger than the sum of its proper divisors (554568693).

642994443 is a wasteful number, since it uses less digits than its factorization.

642994443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166 (or 1157 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 642994443 is about 25357.3350926315. The cubic root of 642994443 is about 863.1158127658.

The spelling of 642994443 in words is "six hundred forty-two million, nine hundred ninety-four thousand, four hundred forty-three".