642357289 has 8 divisors (see below), whose sum is σ = 736737408. Its totient is φ = 548630880.

The previous prime is 642357269. The next prime is 642357307. The reversal of 642357289 is 982753246.

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

It is not a de Polignac number, because 642357289 - 2⁷ = 642357161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642357229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161317 + ... + 165250.

It is an arithmetic number, because the mean of its divisors is an integer number (92092176).

Almost surely, 2^642357289 is an apocalyptic number.

It is an amenable number.

642357289 is a deficient number, since it is larger than the sum of its proper divisors (94380119).

642357289 is a wasteful number, since it uses less digits than its factorization.

642357289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326855.

The product of its digits is 725760, while the sum is 46.

The square root of 642357289 is about 25344.7684739869. The cubic root of 642357289 is about 862.8306265582.

The spelling of 642357289 in words is "six hundred forty-two million, three hundred fifty-seven thousand, two hundred eighty-nine".