642821882764 has 24 divisors (see below), whose sum is σ = 1135244548368. Its totient is φ = 318468057600.

The previous prime is 642821882761. The next prime is 642821882767. The reversal of 642821882764 is 467288128246.

It is an interprime number because it is at equal distance from previous prime (642821882761) and next prime (642821882767).

It is a junction number, because it is equal to n+sod(n) for n = 642821882699 and 642821882708.

It is not an unprimeable number, because it can be changed into a prime (642821882761) 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, 1253839 + ... + 1690489.

It is an arithmetic number, because the mean of its divisors is an integer number (47301856182).

Almost surely, 2^642821882764 is an apocalyptic number.

It is an amenable number.

642821882764 is a deficient number, since it is larger than the sum of its proper divisors (492422665604).

642821882764 is a wasteful number, since it uses less digits than its factorization.

642821882764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440025 (or 440023 counting only the distinct ones).

The product of its digits is 16515072, while the sum is 58.

The spelling of 642821882764 in words is "six hundred forty-two billion, eight hundred twenty-one million, eight hundred eighty-two thousand, seven hundred sixty-four".