640546338 has 8 divisors (see below), whose sum is σ = 1281092688. Its totient is φ = 213515444.

The previous prime is 640546337. The next prime is 640546351. The reversal of 640546338 is 833645046.

640546338 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

640546338 is an admirable number.

It is a super-2 number, since 2×640546338² = 820599222250420488, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640546296 and 640546305.

It is not an unprimeable number, because it can be changed into a prime (640546337) 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, 53378856 + ... + 53378867.

It is an arithmetic number, because the mean of its divisors is an integer number (160136586).

Almost surely, 2^640546338 is an apocalyptic number.

640546338 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

640546338 is a wasteful number, since it uses less digits than its factorization.

640546338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106757728.

The product of its (nonzero) digits is 207360, while the sum is 39.

The square root of 640546338 is about 25309.0169307304. The cubic root of 640546338 is about 862.0190249227.

The spelling of 640546338 in words is "six hundred forty million, five hundred forty-six thousand, three hundred thirty-eight".