640828046 has 8 divisors (see below), whose sum is σ = 961453800. Its totient is φ = 320343448.

The previous prime is 640828021. The next prime is 640828057.

It is a happy number.

640828046 is nontrivially palindromic in base 10.

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

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, 23096 + ... + 42603.

It is an arithmetic number, because the mean of its divisors is an integer number (120181725).

Almost surely, 2^640828046 is an apocalyptic number.

640828046 is a deficient number, since it is larger than the sum of its proper divisors (320625754).

640828046 is a wasteful number, since it uses less digits than its factorization.

640828046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70578.

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 640828046 is about 25314.5816872411. The cubic root of 640828046 is about 862.1453764710.

The spelling of 640828046 in words is "six hundred forty million, eight hundred twenty-eight thousand, forty-six".