640163093 has 4 divisors (see below), whose sum is σ = 641005068. Its totient is φ = 639321120.

The previous prime is 640163089. The next prime is 640163107. The reversal of 640163093 is 390361046.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 323928004 + 316235089 = 17998^2 + 17783^2 .

It is a cyclic number.

It is not a de Polignac number, because 640163093 - 2² = 640163089 is a prime.

It is a super-3 number, since 3×640163093³ (a number of 27 digits) contains 333 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 (640163063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419846 + ... + 421367.

It is an arithmetic number, because the mean of its divisors is an integer number (160251267).

Almost surely, 2^640163093 is an apocalyptic number.

It is an amenable number.

640163093 is a deficient number, since it is larger than the sum of its proper divisors (841975).

640163093 is an equidigital number, since it uses as much as digits as its factorization.

640163093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841974.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 640163093 is about 25301.4444844558. Note that the first 4 decimals coincide. The cubic root of 640163093 is about 861.8470725490.

The spelling of 640163093 in words is "six hundred forty million, one hundred sixty-three thousand, ninety-three".