642117012 has 48 divisors (see below), whose sum is σ = 1569748992. Its totient is φ = 204035040.

The previous prime is 642116941. The next prime is 642117017. The reversal of 642117012 is 210711246.

642117012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642117017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12043 + ... + 37805.

It is an arithmetic number, because the mean of its divisors is an integer number (32703104).

Almost surely, 2^642117012 is an apocalyptic number.

642117012 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

642117012 is an abundant number, since it is smaller than the sum of its proper divisors (927631980).

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

642117012 is a wasteful number, since it uses less digits than its factorization.

642117012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25868 (or 25866 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 642117012 is about 25340.0278610739. The cubic root of 642117012 is about 862.7230310850.

Adding to 642117012 its reverse (210711246), we get a palindrome (852828258).

The spelling of 642117012 in words is "six hundred forty-two million, one hundred seventeen thousand, twelve".