642359069 has 16 divisors (see below), whose sum is σ = 718502400. Its totient is φ = 569229360.

The previous prime is 642359023. The next prime is 642359089. The reversal of 642359069 is 960953246.

It is a cyclic number.

It is not a de Polignac number, because 642359069 - 2²⁰ = 641310493 is a prime.

It is a super-2 number, since 2×642359069² = 825250347053093522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642359089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304982 + ... + 307080.

It is an arithmetic number, because the mean of its divisors is an integer number (44906400).

Almost surely, 2^642359069 is an apocalyptic number.

It is an amenable number.

642359069 is a deficient number, since it is larger than the sum of its proper divisors (76143331).

642359069 is a wasteful number, since it uses less digits than its factorization.

642359069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2800.

The product of its (nonzero) digits is 349920, while the sum is 44.

The square root of 642359069 is about 25344.8035896907. The cubic root of 642359069 is about 862.8314235378.

The spelling of 642359069 in words is "six hundred forty-two million, three hundred fifty-nine thousand, sixty-nine".