640162830 has 16 divisors (see below), whose sum is σ = 1536390864. Its totient is φ = 170710080.

The previous prime is 640162811. The next prime is 640162867. The reversal of 640162830 is 38261046.

It is a super-3 number, since 3×640162830³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 21338761 = 640162830 / (6 + 4 + 0 + 1 + 6 + 2 + 8 + 3 + 0).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10669351 + ... + 10669410.

It is an arithmetic number, because the mean of its divisors is an integer number (96024429).

Almost surely, 2^640162830 is an apocalyptic number.

640162830 is an abundant number, since it is smaller than the sum of its proper divisors (896228034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640162830 is a wasteful number, since it uses less digits than its factorization.

640162830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21338771.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 640162830 is about 25301.4392871236. The cubic root of 640162830 is about 861.8469545240.

The spelling of 640162830 in words is "six hundred forty million, one hundred sixty-two thousand, eight hundred thirty".