642250027 has 4 divisors (see below), whose sum is σ = 676052680. Its totient is φ = 608447376.

The previous prime is 642250009. The next prime is 642250039. The reversal of 642250027 is 720052246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642250027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642249977 and 642250004.

It is not an unprimeable number, because it can be changed into a prime (642250057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16901298 + ... + 16901335.

It is an arithmetic number, because the mean of its divisors is an integer number (169013170).

Almost surely, 2^642250027 is an apocalyptic number.

642250027 is a deficient number, since it is larger than the sum of its proper divisors (33802653).

642250027 is a wasteful number, since it uses less digits than its factorization.

642250027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33802652.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 642250027 is about 25342.6523276472. The cubic root of 642250027 is about 862.7825982038.

The spelling of 642250027 in words is "six hundred forty-two million, two hundred fifty thousand, twenty-seven".