640555046 has 8 divisors (see below), whose sum is σ = 991827264. Its totient is φ = 309945960.

The previous prime is 640555031. The next prime is 640555061.

640555046 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (640555031) and next prime (640555061).

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

It is a junction number, because it is equal to n+sod(n) for n = 640554997 and 640555015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5165705 + ... + 5165828.

It is an arithmetic number, because the mean of its divisors is an integer number (123978408).

Almost surely, 2^640555046 is an apocalyptic number.

640555046 is a deficient number, since it is larger than the sum of its proper divisors (351272218).

640555046 is a wasteful number, since it uses less digits than its factorization.

640555046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10331566.

The product of its (nonzero) digits is 72000, while the sum is 35.

The square root of 640555046 is about 25309.1889636946. The cubic root of 640555046 is about 862.0229311858.

The spelling of 640555046 in words is "six hundred forty million, five hundred fifty-five thousand, forty-six".