642743269 has 8 divisors (see below), whose sum is σ = 759893760. Its totient is φ = 531925296.

The previous prime is 642743263. The next prime is 642743279. The reversal of 642743269 is 962347246.

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

It is not a de Polignac number, because 642743269 - 2¹³ = 642735077 is a prime.

It is a super-2 number, since 2×642743269² = 826237819689612722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642743263) 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 7 ways as a sum of consecutive naturals, for example, 1582909 + ... + 1583314.

It is an arithmetic number, because the mean of its divisors is an integer number (94986720).

Almost surely, 2^642743269 is an apocalyptic number.

It is an amenable number.

642743269 is a deficient number, since it is larger than the sum of its proper divisors (117150491).

642743269 is a wasteful number, since it uses less digits than its factorization.

642743269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3166259.

The product of its digits is 435456, while the sum is 43.

The square root of 642743269 is about 25352.3819196540. The cubic root of 642743269 is about 863.0034113351.

The spelling of 642743269 in words is "six hundred forty-two million, seven hundred forty-three thousand, two hundred sixty-nine".