642747306 has 8 divisors (see below), whose sum is σ = 1285494624. Its totient is φ = 214249100.

The previous prime is 642747299. The next prime is 642747307. The reversal of 642747306 is 603747246.

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

642747306 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (642747307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53562270 + ... + 53562281.

It is an arithmetic number, because the mean of its divisors is an integer number (160686828).

Almost surely, 2^642747306 is an apocalyptic number.

642747306 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642747306 is a wasteful number, since it uses less digits than its factorization.

642747306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107124556.

The product of its (nonzero) digits is 169344, while the sum is 39.

The square root of 642747306 is about 25352.4615372946. The cubic root of 642747306 is about 863.0052181412.

The spelling of 642747306 in words is "six hundred forty-two million, seven hundred forty-seven thousand, three hundred six".