642278833 has 8 divisors (see below), whose sum is σ = 734221760. Its totient is φ = 550383120.

The previous prime is 642278803. The next prime is 642278837. The reversal of 642278833 is 338872246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 642278833 - 2¹³ = 642270641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642278833.

It is not an unprimeable number, because it can be changed into a prime (642278837) 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 7 ways as a sum of consecutive naturals, for example, 25018 + ... + 43708.

It is an arithmetic number, because the mean of its divisors is an integer number (91777720).

Almost surely, 2^642278833 is an apocalyptic number.

It is an amenable number.

642278833 is a deficient number, since it is larger than the sum of its proper divisors (91942927).

642278833 is a wasteful number, since it uses less digits than its factorization.

642278833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23607.

The product of its digits is 387072, while the sum is 43.

The square root of 642278833 is about 25343.2206516851. The cubic root of 642278833 is about 862.7954970972.

The spelling of 642278833 in words is "six hundred forty-two million, two hundred seventy-eight thousand, eight hundred thirty-three".