642737959 has 8 divisors (see below), whose sum is σ = 648248832. Its totient is φ = 637251000.

The previous prime is 642737951. The next prime is 642737971. The reversal of 642737959 is 959737246.

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 642737959 - 2³ = 642737951 is a prime.

It is a super-2 number, since 2×642737959² = 826224167878971362, 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 (642737951) 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 7 ways as a sum of consecutive naturals, for example, 50232 + ... + 61714.

It is an arithmetic number, because the mean of its divisors is an integer number (81031104).

Almost surely, 2^642737959 is an apocalyptic number.

642737959 is a deficient number, since it is larger than the sum of its proper divisors (5510873).

642737959 is a wasteful number, since it uses less digits than its factorization.

642737959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11957.

The product of its digits is 2857680, while the sum is 52.

The square root of 642737959 is about 25352.2771955499. The cubic root of 642737959 is about 863.0010347715.

The spelling of 642737959 in words is "six hundred forty-two million, seven hundred thirty-seven thousand, nine hundred fifty-nine".