642427544 has 32 divisors (see below), whose sum is σ = 1383220800. Its totient is φ = 276642720.

The previous prime is 642427529. The next prime is 642427549. The reversal of 642427544 is 445724246.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 642427498 and 642427507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642427549) 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 7 ways as a sum of consecutive naturals, for example, 190442 + ... + 193785.

It is an arithmetic number, because the mean of its divisors is an integer number (43225650).

Almost surely, 2^642427544 is an apocalyptic number.

It is an amenable number.

642427544 is an abundant number, since it is smaller than the sum of its proper divisors (740793256).

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

642427544 is a wasteful number, since it uses less digits than its factorization.

642427544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384263 (or 384259 counting only the distinct ones).

The product of its digits is 215040, while the sum is 38.

The square root of 642427544 is about 25346.1544223182. The cubic root of 642427544 is about 862.8620815116.

The spelling of 642427544 in words is "six hundred forty-two million, four hundred twenty-seven thousand, five hundred forty-four".