642356306 has 4 divisors (see below), whose sum is σ = 963534462. Its totient is φ = 321178152.

The previous prime is 642356287. The next prime is 642356321. The reversal of 642356306 is 603653246.

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

It can be written as a sum of positive squares in only one way, i.e., 638320225 + 4036081 = 25265^2 + 2009^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160589075 + ... + 160589078.

Almost surely, 2^642356306 is an apocalyptic number.

642356306 is a deficient number, since it is larger than the sum of its proper divisors (321178156).

642356306 is a wasteful number, since it uses less digits than its factorization.

642356306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321178155.

The product of its (nonzero) digits is 77760, while the sum is 35.

The square root of 642356306 is about 25344.7490814172. The cubic root of 642356306 is about 862.8301864277.

The spelling of 642356306 in words is "six hundred forty-two million, three hundred fifty-six thousand, three hundred six".