642024646440 has 64 divisors (see below), whose sum is σ = 1926136575360. Its totient is φ = 171201004800.

The previous prime is 642024646399. The next prime is 642024646469. The reversal of 642024646440 is 44646420246.

It is a junction number, because it is equal to n+sod(n) for n = 642024646392 and 642024646401.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4721077 + ... + 4855163.

It is an arithmetic number, because the mean of its divisors is an integer number (30095883990).

Almost surely, 2^642024646440 is an apocalyptic number.

642024646440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642024646440 is an abundant number, since it is smaller than the sum of its proper divisors (1284111928920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642024646440 is a wasteful number, since it uses less digits than its factorization.

642024646440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174002 (or 173998 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 42.

The spelling of 642024646440 in words is "six hundred forty-two billion, twenty-four million, six hundred forty-six thousand, four hundred forty".