642927641 has 8 divisors (see below), whose sum is σ = 682549920. Its totient is φ = 603505728.

The previous prime is 642927619. The next prime is 642927647. The reversal of 642927641 is 146729246.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642927641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642927647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43451 + ... + 56336.

It is an arithmetic number, because the mean of its divisors is an integer number (85318740).

Almost surely, 2^642927641 is an apocalyptic number.

It is an amenable number.

642927641 is a deficient number, since it is larger than the sum of its proper divisors (39622279).

642927641 is a wasteful number, since it uses less digits than its factorization.

642927641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100183.

The product of its digits is 145152, while the sum is 41.

The square root of 642927641 is about 25356.0178458685. The cubic root of 642927641 is about 863.0859214450.

The spelling of 642927641 in words is "six hundred forty-two million, nine hundred twenty-seven thousand, six hundred forty-one".