642525246 has 36 divisors (see below), whose sum is σ = 1530206496. Its totient is φ = 194703960.

The previous prime is 642525241. The next prime is 642525253.

642525246 is a `hidden beast` number, since 642 + 5 + 2 + 5 + 2 + 4 + 6 = 666.

642525246 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 642525246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642525241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 145326 + ... + 149681.

It is an arithmetic number, because the mean of its divisors is an integer number (42505736).

Almost surely, 2^642525246 is an apocalyptic number.

642525246 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

642525246 is an abundant number, since it is smaller than the sum of its proper divisors (887681250).

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

642525246 is a wasteful number, since it uses less digits than its factorization.

642525246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295037 (or 295023 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

The square root of 642525246 is about 25348.0817025668. The cubic root of 642525246 is about 862.9058213743.

The spelling of 642525246 in words is "six hundred forty-two million, five hundred twenty-five thousand, two hundred forty-six".