642005269 has 8 divisors (see below), whose sum is σ = 679002080. Its totient is φ = 605329200.

The previous prime is 642005251. The next prime is 642005293. The reversal of 642005269 is 962500246.

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 642005269 - 2¹³ = 641997077 is a prime.

It is a super-2 number, since 2×642005269² = 824341530847524722, 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 (642005209) 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, 76062 + ... + 84079.

It is an arithmetic number, because the mean of its divisors is an integer number (84875260).

Almost surely, 2^642005269 is an apocalyptic number.

It is an amenable number.

642005269 is a deficient number, since it is larger than the sum of its proper divisors (36996811).

642005269 is a wasteful number, since it uses less digits than its factorization.

642005269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160371.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 642005269 is about 25337.8228938478. The cubic root of 642005269 is about 862.6729836894.

The spelling of 642005269 in words is "six hundred forty-two million, five thousand, two hundred sixty-nine".