642720567 has 16 divisors (see below), whose sum is σ = 864730080. Its totient is φ = 424607232.

The previous prime is 642720557. The next prime is 642720569. The reversal of 642720567 is 765027246.

It is a happy number.

It is not a de Polignac number, because 642720567 - 2⁷ = 642720439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642720569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 331533 + ... + 333465.

It is an arithmetic number, because the mean of its divisors is an integer number (54045630).

Almost surely, 2^642720567 is an apocalyptic number.

642720567 is a deficient number, since it is larger than the sum of its proper divisors (222009513).

642720567 is a wasteful number, since it uses less digits than its factorization.

642720567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2882.

The product of its (nonzero) digits is 141120, while the sum is 39.

The square root of 642720567 is about 25351.9341865665. The cubic root of 642720567 is about 862.9932506509.

The spelling of 642720567 in words is "six hundred forty-two million, seven hundred twenty thousand, five hundred sixty-seven".