642706453 has 4 divisors (see below), whose sum is σ = 643210240. Its totient is φ = 642202668.

The previous prime is 642706451. The next prime is 642706459. The reversal of 642706453 is 354607246.

642706453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 642706453 - 2¹ = 642706451 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642706451) 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, 249975 + ... + 252532.

It is an arithmetic number, because the mean of its divisors is an integer number (160802560).

Almost surely, 2^642706453 is an apocalyptic number.

It is an amenable number.

642706453 is a deficient number, since it is larger than the sum of its proper divisors (503787).

642706453 is a wasteful number, since it uses less digits than its factorization.

642706453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503786.

The product of its (nonzero) digits is 120960, while the sum is 37.

The square root of 642706453 is about 25351.6558236341. The cubic root of 642706453 is about 862.9869335584.

The spelling of 642706453 in words is "six hundred forty-two million, seven hundred six thousand, four hundred fifty-three".