642722733 has 12 divisors (see below), whose sum is σ = 941095740. Its totient is φ = 422611776.

The previous prime is 642722719. The next prime is 642722771. The reversal of 642722733 is 337227246.

642722733 is a `hidden beast` number, since 6 + 427 + 227 + 3 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 266440329 + 376282404 = 16323^2 + 19398^2 .

It is not a de Polignac number, because 642722733 - 2⁸ = 642722477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642723733) 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 11 ways as a sum of consecutive naturals, for example, 488478 + ... + 489791.

It is an arithmetic number, because the mean of its divisors is an integer number (78424645).

Almost surely, 2^642722733 is an apocalyptic number.

It is an amenable number.

642722733 is a deficient number, since it is larger than the sum of its proper divisors (298373007).

642722733 is a wasteful number, since it uses less digits than its factorization.

642722733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978348 (or 978345 counting only the distinct ones).

The product of its digits is 84672, while the sum is 36.

The square root of 642722733 is about 25351.9769051646. The cubic root of 642722733 is about 862.9942200931.

Adding to 642722733 its reverse (337227246), we get a palindrome (979949979).

The spelling of 642722733 in words is "six hundred forty-two million, seven hundred twenty-two thousand, seven hundred thirty-three".