642763959 has 4 divisors (see below), whose sum is σ = 857018616. Its totient is φ = 428509304.

The previous prime is 642763949. The next prime is 642763969. The reversal of 642763959 is 959367246.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (642763949) and next prime (642763969).

It is a cyclic number.

It is not a de Polignac number, because 642763959 - 2⁴ = 642763943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642763949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107127324 + ... + 107127329.

It is an arithmetic number, because the mean of its divisors is an integer number (214254654).

Almost surely, 2^642763959 is an apocalyptic number.

642763959 is a deficient number, since it is larger than the sum of its proper divisors (214254657).

642763959 is a wasteful number, since it uses less digits than its factorization.

642763959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214254656.

The product of its digits is 2449440, while the sum is 51.

The square root of 642763959 is about 25352.7899648145. The cubic root of 642763959 is about 863.0126713045.

The spelling of 642763959 in words is "six hundred forty-two million, seven hundred sixty-three thousand, nine hundred fifty-nine".