640000337 has 8 divisors (see below), whose sum is σ = 647959080. Its totient is φ = 632073600.

The previous prime is 640000331. The next prime is 640000357. The reversal of 640000337 is 733000046.

It can be written as a sum of positive squares in 4 ways, for example, as 231313681 + 408686656 = 15209^2 + 20216^2 .

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 640000337 - 2⁴ = 640000321 is a prime.

It is a super-2 number, since 2×640000337² = 819200862720227138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640000331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33563 + ... + 49055.

It is an arithmetic number, because the mean of its divisors is an integer number (80994885).

Almost surely, 2^640000337 is an apocalyptic number.

It is an amenable number.

640000337 is a deficient number, since it is larger than the sum of its proper divisors (7958743).

640000337 is a wasteful number, since it uses less digits than its factorization.

640000337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16003.

The product of its (nonzero) digits is 1512, while the sum is 23.

The square root of 640000337 is about 25298.2279418935. The cubic root of 640000337 is about 861.7740272720.

The spelling of 640000337 in words is "six hundred forty million, three hundred thirty-seven", and thus it is an aban number.