642854289 has 32 divisors (see below), whose sum is σ = 1076382720. Its totient is φ = 331531200.

The previous prime is 642854287. The next prime is 642854291. The reversal of 642854289 is 982458246.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (642854287) and next prime (642854291).

It is not a de Polignac number, because 642854289 - 2¹ = 642854287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642854287) 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 31 ways as a sum of consecutive naturals, for example, 22099 + ... + 42119.

It is an arithmetic number, because the mean of its divisors is an integer number (33636960).

Almost surely, 2^642854289 is an apocalyptic number.

It is an amenable number.

642854289 is a deficient number, since it is larger than the sum of its proper divisors (433528431).

642854289 is a wasteful number, since it uses less digits than its factorization.

642854289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20181.

The product of its digits is 1105920, while the sum is 48.

The square root of 642854289 is about 25354.5713629712. The cubic root of 642854289 is about 863.0530968666.

The spelling of 642854289 in words is "six hundred forty-two million, eight hundred fifty-four thousand, two hundred eighty-nine".