642621343 has 16 divisors (see below), whose sum is σ = 805847616. Its totient is φ = 498850560.

The previous prime is 642621341. The next prime is 642621361. The reversal of 642621343 is 343126246.

It is not a de Polignac number, because 642621343 - 2¹ = 642621341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642621341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61798 + ... + 71443.

It is an arithmetic number, because the mean of its divisors is an integer number (50365476).

Almost surely, 2^642621343 is an apocalyptic number.

642621343 is a deficient number, since it is larger than the sum of its proper divisors (163226273).

642621343 is a wasteful number, since it uses less digits than its factorization.

642621343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133314.

The product of its digits is 20736, while the sum is 31.

The square root of 642621343 is about 25349.9771794769. The cubic root of 642621343 is about 862.9488383751.

Adding to 642621343 its reverse (343126246), we get a palindrome (985747589).

The spelling of 642621343 in words is "six hundred forty-two million, six hundred twenty-one thousand, three hundred forty-three".