642263238 has 12 divisors (see below), whose sum is σ = 1391570388. Its totient is φ = 214087740.

The previous prime is 642263233. The next prime is 642263243. The reversal of 642263238 is 832362246.

642263238 is a `hidden beast` number, since 642 + 2 + 6 + 3 + 2 + 3 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (642263233) and next prime (642263243).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642263233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17840628 + ... + 17840663.

It is an arithmetic number, because the mean of its divisors is an integer number (115964199).

Almost surely, 2^642263238 is an apocalyptic number.

642263238 is an abundant number, since it is smaller than the sum of its proper divisors (749307150).

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

642263238 is a wasteful number, since it uses less digits than its factorization.

642263238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35681299 (or 35681296 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 642263238 is about 25342.9129738473. The cubic root of 642263238 is about 862.7885139387.

The spelling of 642263238 in words is "six hundred forty-two million, two hundred sixty-three thousand, two hundred thirty-eight".