642223378 has 8 divisors (see below), whose sum is σ = 979662960. Its totient is φ = 315669060.

The previous prime is 642223363. The next prime is 642223381. The reversal of 642223378 is 873322246.

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2721168 + ... + 2721403.

It is an arithmetic number, because the mean of its divisors is an integer number (122457870).

Almost surely, 2^642223378 is an apocalyptic number.

642223378 is a deficient number, since it is larger than the sum of its proper divisors (337439582).

642223378 is a wasteful number, since it uses less digits than its factorization.

642223378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5442632.

The product of its digits is 96768, while the sum is 37.

The square root of 642223378 is about 25342.1265484963. The cubic root of 642223378 is about 862.7706648391.

It can be divided in two parts, 64222 and 3378, that added together give a square (67600 = 260²).

The spelling of 642223378 in words is "six hundred forty-two million, two hundred twenty-three thousand, three hundred seventy-eight".