642702841 has 16 divisors (see below), whose sum is σ = 711671040. Its totient is φ = 575527680.

The previous prime is 642702829. The next prime is 642702887. The reversal of 642702841 is 148207246.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 642702841 - 2⁷ = 642702713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642702797 and 642702806.

It is not an unprimeable number, because it can be changed into a prime (642732841) 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 15 ways as a sum of consecutive naturals, for example, 657345 + ... + 658321.

It is an arithmetic number, because the mean of its divisors is an integer number (44479440).

Almost surely, 2^642702841 is an apocalyptic number.

It is an amenable number.

642702841 is a deficient number, since it is larger than the sum of its proper divisors (68968199).

642702841 is a wasteful number, since it uses less digits than its factorization.

642702841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 642702841 is about 25351.5845855836. The cubic root of 642702841 is about 862.9853168977.

The spelling of 642702841 in words is "six hundred forty-two million, seven hundred two thousand, eight hundred forty-one".