646063400 has 48 divisors (see below), whose sum is σ = 1503770940. Its totient is φ = 258137600.

The previous prime is 646063309. The next prime is 646063409. The reversal of 646063400 is 4360646.

It can be written as a sum of positive squares in 6 ways, for example, as 352763524 + 293299876 = 18782^2 + 17126^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646063409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 343262 + ... + 345138.

Almost surely, 2^646063400 is an apocalyptic number.

It is an amenable number.

646063400 is an abundant number, since it is smaller than the sum of its proper divisors (857707540).

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

646063400 is a wasteful number, since it uses less digits than its factorization.

646063400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3614 (or 3605 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 646063400 is about 25417.7772434963. Note that the first 3 decimals coincide. The cubic root of 646063400 is about 864.4868262661.

The spelling of 646063400 in words is "six hundred forty-six million, sixty-three thousand, four hundred".