642628339 has 8 divisors (see below), whose sum is σ = 693269280. Its totient is φ = 593414016.

The previous prime is 642628307. The next prime is 642628379. The reversal of 642628339 is 933826246.

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

It is a cyclic number.

It is not a de Polignac number, because 642628339 - 2⁵ = 642628307 is a prime.

It is a super-3 number, since 3×642628339³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642628295 and 642628304.

It is not an unprimeable number, because it can be changed into a prime (642628379) 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, 355719 + ... + 357520.

It is an arithmetic number, because the mean of its divisors is an integer number (86658660).

Almost surely, 2^642628339 is an apocalyptic number.

642628339 is a deficient number, since it is larger than the sum of its proper divisors (50640941).

642628339 is a wasteful number, since it uses less digits than its factorization.

642628339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713309.

The product of its digits is 373248, while the sum is 43.

The square root of 642628339 is about 25350.1151673913. The cubic root of 642628339 is about 862.9519699073.

The spelling of 642628339 in words is "six hundred forty-two million, six hundred twenty-eight thousand, three hundred thirty-nine".