642746733 has 4 divisors (see below), whose sum is σ = 856995648. Its totient is φ = 428497820.

The previous prime is 642746719. The next prime is 642746737. The reversal of 642746733 is 337647246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 642746733 - 2¹³ = 642738541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642746737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107124453 + ... + 107124458.

It is an arithmetic number, because the mean of its divisors is an integer number (214248912).

Almost surely, 2^642746733 is an apocalyptic number.

It is an amenable number.

642746733 is a deficient number, since it is larger than the sum of its proper divisors (214248915).

642746733 is a wasteful number, since it uses less digits than its factorization.

642746733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214248914.

The product of its digits is 508032, while the sum is 42.

The square root of 642746733 is about 25352.4502366142. The cubic root of 642746733 is about 863.0049616889.

The spelling of 642746733 in words is "six hundred forty-two million, seven hundred forty-six thousand, seven hundred thirty-three".