642692841 has 64 divisors (see below), whose sum is σ = 1094860800. Its totient is φ = 326880576.

The previous prime is 642692833. The next prime is 642692873. The reversal of 642692841 is 148296246.

It is not a de Polignac number, because 642692841 - 2³ = 642692833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642692793 and 642692802.

It is not an unprimeable number, because it can be changed into a prime (642692041) 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 63 ways as a sum of consecutive naturals, for example, 540850 + ... + 542036.

It is an arithmetic number, because the mean of its divisors is an integer number (17107200).

Almost surely, 2^642692841 is an apocalyptic number.

It is an amenable number.

642692841 is a deficient number, since it is larger than the sum of its proper divisors (452167959).

642692841 is a wasteful number, since it uses less digits than its factorization.

642692841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298.

The product of its digits is 165888, while the sum is 42.

The square root of 642692841 is about 25351.3873584859. The cubic root of 642692841 is about 862.9808410615.

The spelling of 642692841 in words is "six hundred forty-two million, six hundred ninety-two thousand, eight hundred forty-one".