642510671 has 8 divisors (see below), whose sum is σ = 702673488. Its totient is φ = 582640000.

The previous prime is 642510667. The next prime is 642510697. The reversal of 642510671 is 176015246.

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

It is a cyclic number.

It is not a de Polignac number, because 642510671 - 2² = 642510667 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642516671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68420 + ... + 77241.

It is an arithmetic number, because the mean of its divisors is an integer number (87834186).

Almost surely, 2^642510671 is an apocalyptic number.

642510671 is a deficient number, since it is larger than the sum of its proper divisors (60162817).

642510671 is a wasteful number, since it uses less digits than its factorization.

642510671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146073.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 642510671 is about 25347.7942038356. The cubic root of 642510671 is about 862.8992966255.

The spelling of 642510671 in words is "six hundred forty-two million, five hundred ten thousand, six hundred seventy-one".