646539450 has 24 divisors (see below), whose sum is σ = 1603418208. Its totient is φ = 172410480.

The previous prime is 646539449. The next prime is 646539469. The reversal of 646539450 is 54935646.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2154982 + ... + 2155281.

It is an arithmetic number, because the mean of its divisors is an integer number (66809092).

Almost surely, 2^646539450 is an apocalyptic number.

646539450 is an abundant number, since it is smaller than the sum of its proper divisors (956878758).

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

646539450 is a wasteful number, since it uses less digits than its factorization.

646539450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4310278 (or 4310273 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 42.

The square root of 646539450 is about 25427.1400279308. The cubic root of 646539450 is about 864.6991056980.

The spelling of 646539450 in words is "six hundred forty-six million, five hundred thirty-nine thousand, four hundred fifty".