642290027 has 4 divisors (see below), whose sum is σ = 642341760. Its totient is φ = 642238296.

The previous prime is 642290017. The next prime is 642290053. The reversal of 642290027 is 720092246.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 642290027 - 2²⁰ = 641241451 is a prime.

It is a deceptive number, since it divides R_642290026.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642289975 and 642290002.

It is not an unprimeable number, because it can be changed into a prime (642290017) 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 3 ways as a sum of consecutive naturals, for example, 5174 + ... + 36212.

It is an arithmetic number, because the mean of its divisors is an integer number (160585440).

Almost surely, 2^642290027 is an apocalyptic number.

642290027 is the 20693-rd pentagonal number.

642290027 is a deficient number, since it is larger than the sum of its proper divisors (51733).

642290027 is a wasteful number, since it uses less digits than its factorization.

642290027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51732.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 642290027 is about 25343.4414987389. The cubic root of 642290027 is about 862.8005094980.

The spelling of 642290027 in words is "six hundred forty-two million, two hundred ninety thousand, twenty-seven".