642249334 has 8 divisors (see below), whose sum is σ = 963645408. Its totient is φ = 321034200.

The previous prime is 642249331. The next prime is 642249347. The reversal of 642249334 is 433942246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 642249293 and 642249302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642249331) 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, 35982 + ... + 50785.

It is an arithmetic number, because the mean of its divisors is an integer number (120455676).

Almost surely, 2^642249334 is an apocalyptic number.

642249334 is a deficient number, since it is larger than the sum of its proper divisors (321396074).

642249334 is a wasteful number, since it uses less digits than its factorization.

642249334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90470.

The product of its digits is 124416, while the sum is 37.

The square root of 642249334 is about 25342.6386550414. The cubic root of 642249334 is about 862.7822878841.

The spelling of 642249334 in words is "six hundred forty-two million, two hundred forty-nine thousand, three hundred thirty-four".