642726707 has 16 divisors (see below), whose sum is σ = 761114880. Its totient is φ = 531334752.

The previous prime is 642726703. The next prime is 642726713. The reversal of 642726707 is 707627246.

It is not a de Polignac number, because 642726707 - 2² = 642726703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642726703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7208 + ... + 36570.

It is an arithmetic number, because the mean of its divisors is an integer number (47569680).

Almost surely, 2^642726707 is an apocalyptic number.

642726707 is a deficient number, since it is larger than the sum of its proper divisors (118388173).

642726707 is a wasteful number, since it uses less digits than its factorization.

642726707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29482.

The product of its (nonzero) digits is 197568, while the sum is 41.

The square root of 642726707 is about 25352.0552815743. The cubic root of 642726707 is about 862.9959987408.

The spelling of 642726707 in words is "six hundred forty-two million, seven hundred twenty-six thousand, seven hundred seven".