642246224 has 10 divisors (see below), whose sum is σ = 1244352090. Its totient is φ = 321123104.

The previous prime is 642246197. The next prime is 642246229. The reversal of 642246224 is 422642246.

It can be written as a sum of positive squares in only one way, i.e., 587189824 + 55056400 = 24232^2 + 7420^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642246229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20070179 + ... + 20070210.

It is an arithmetic number, because the mean of its divisors is an integer number (124435209).

Almost surely, 2^642246224 is an apocalyptic number.

It is an amenable number.

642246224 is a deficient number, since it is larger than the sum of its proper divisors (602105866).

642246224 is a wasteful number, since it uses less digits than its factorization.

642246224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40140397 (or 40140391 counting only the distinct ones).

The product of its digits is 36864, while the sum is 32.

The square root of 642246224 is about 25342.5772959263. The cubic root of 642246224 is about 862.7808952488.

The spelling of 642246224 in words is "six hundred forty-two million, two hundred forty-six thousand, two hundred twenty-four".