642747369 has 16 divisors (see below), whose sum is σ = 939660480. Its totient is φ = 387562560.

The previous prime is 642747349. The next prime is 642747383. The reversal of 642747369 is 963747246.

It is not a de Polignac number, because 642747369 - 2⁵ = 642747337 is a prime.

It is a super-2 number, since 2×642747369² = 826248360712844322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (642747319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42934 + ... + 55935.

It is an arithmetic number, because the mean of its divisors is an integer number (58728780).

Almost surely, 2^642747369 is an apocalyptic number.

It is an amenable number.

642747369 is a deficient number, since it is larger than the sum of its proper divisors (296913111).

642747369 is a wasteful number, since it uses less digits than its factorization.

642747369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99080.

The product of its digits is 1524096, while the sum is 48.

The square root of 642747369 is about 25352.4627797774. The cubic root of 642747369 is about 863.0052463376.

The spelling of 642747369 in words is "six hundred forty-two million, seven hundred forty-seven thousand, three hundred sixty-nine".