646638014 has 8 divisors (see below), whose sum is σ = 1058134968. Its totient is φ = 293926360.

The previous prime is 646638007. The next prime is 646638023. The reversal of 646638014 is 410836646.

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

It is a super-2 number, since 2×646638014² = 836281442299728392, which contains 22 as substring.

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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14696297 + ... + 14696340.

It is an arithmetic number, because the mean of its divisors is an integer number (132266871).

Almost surely, 2^646638014 is an apocalyptic number.

646638014 is a deficient number, since it is larger than the sum of its proper divisors (411496954).

646638014 is a wasteful number, since it uses less digits than its factorization.

646638014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29392650.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 646638014 is about 25429.0781193499. The cubic root of 646638014 is about 864.7430441729.

The spelling of 646638014 in words is "six hundred forty-six million, six hundred thirty-eight thousand, fourteen".