642067993 has 8 divisors (see below), whose sum is σ = 753624512. Its totient is φ = 535469616.

The previous prime is 642067991. The next prime is 642067999. The reversal of 642067993 is 399760246.

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 642067993 - 2¹ = 642067991 is a prime.

It is a super-4 number, since 4×642067993⁴ (a number of 36 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642067991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1239255 + ... + 1239772.

It is an arithmetic number, because the mean of its divisors is an integer number (94203064).

Almost surely, 2^642067993 is an apocalyptic number.

It is an amenable number.

642067993 is a deficient number, since it is larger than the sum of its proper divisors (111556519).

642067993 is a wasteful number, since it uses less digits than its factorization.

642067993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2479071.

The product of its (nonzero) digits is 489888, while the sum is 46.

The square root of 642067993 is about 25339.0606179471. The cubic root of 642067993 is about 862.7010771962.

The spelling of 642067993 in words is "six hundred forty-two million, sixty-seven thousand, nine hundred ninety-three".