642623489 has 8 divisors (see below), whose sum is σ = 654937920. Its totient is φ = 630426096.

The previous prime is 642623483. The next prime is 642623497. The reversal of 642623489 is 984326246.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642623489 is a prime.

It is a super-2 number, since 2×642623489² = 825929897229066242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642623483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18134 + ... + 40175.

It is an arithmetic number, because the mean of its divisors is an integer number (81867240).

Almost surely, 2^642623489 is an apocalyptic number.

It is an amenable number.

642623489 is a deficient number, since it is larger than the sum of its proper divisors (12314431).

642623489 is a wasteful number, since it uses less digits than its factorization.

642623489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58519.

The product of its digits is 497664, while the sum is 44.

The square root of 642623489 is about 25350.0195068958. The cubic root of 642623489 is about 862.9497989647.

The spelling of 642623489 in words is "six hundred forty-two million, six hundred twenty-three thousand, four hundred eighty-nine".