646654016 has 28 divisors (see below), whose sum is σ = 1338998592. Its totient is φ = 309268608.

The previous prime is 646653991. The next prime is 646654031. The reversal of 646654016 is 610456646.

It is a super-2 number, since 2×646654016² = 836322832817856512, which contains 22 as substring.

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, 218180 + ... + 221123.

Almost surely, 2^646654016 is an apocalyptic number.

It is an amenable number.

646654016 is an abundant number, since it is smaller than the sum of its proper divisors (692344576).

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

646654016 is a wasteful number, since it uses less digits than its factorization.

646654016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439338 (or 439328 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 646654016 is about 25429.3927572013. The cubic root of 646654016 is about 864.7501772230.

The spelling of 646654016 in words is "six hundred forty-six million, six hundred fifty-four thousand, sixteen".