640003337 has 4 divisors (see below), whose sum is σ = 648770580. Its totient is φ = 631236096.

The previous prime is 640003327. The next prime is 640003409. The reversal of 640003337 is 733300046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 733300046 = 2 ⋅366650023.

It can be written as a sum of positive squares in 2 ways, for example, as 152300281 + 487703056 = 12341^2 + 22084^2 .

It is a cyclic number.

It is not a de Polignac number, because 640003337 - 2⁴ = 640003321 is a prime.

It is a super-2 number, since 2×640003337² = 819208542742271138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640003327) 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 3 ways as a sum of consecutive naturals, for example, 4383512 + ... + 4383657.

It is an arithmetic number, because the mean of its divisors is an integer number (162192645).

Almost surely, 2^640003337 is an apocalyptic number.

It is an amenable number.

640003337 is a deficient number, since it is larger than the sum of its proper divisors (8767243).

640003337 is an equidigital number, since it uses as much as digits as its factorization.

640003337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8767242.

The product of its (nonzero) digits is 4536, while the sum is 26.

The square root of 640003337 is about 25298.2872345145. The cubic root of 640003337 is about 861.7753737911.

The spelling of 640003337 in words is "six hundred forty million, three thousand, three hundred thirty-seven".