642822406 has 4 divisors (see below), whose sum is σ = 964233612. Its totient is φ = 321411202.

The previous prime is 642822361. The next prime is 642822409. The reversal of 642822406 is 604228246.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642822409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160705600 + ... + 160705603.

It is an arithmetic number, because the mean of its divisors is an integer number (241058403).

Almost surely, 2^642822406 is an apocalyptic number.

642822406 is a deficient number, since it is larger than the sum of its proper divisors (321411206).

642822406 is a wasteful number, since it uses less digits than its factorization.

642822406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321411205.

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 642822406 is about 25353.9426125406. The cubic root of 642822406 is about 863.0388286375.

The spelling of 642822406 in words is "six hundred forty-two million, eight hundred twenty-two thousand, four hundred six".