646238450 has 192 divisors, whose sum is σ = 1529902080. Its totient is φ = 199584000.

The previous prime is 646238449. The next prime is 646238473. The reversal of 646238450 is 54832646.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9101915 + ... + 9101985.

It is an arithmetic number, because the mean of its divisors is an integer number (7968240).

Almost surely, 2^646238450 is an apocalyptic number.

646238450 is an abundant number, since it is smaller than the sum of its proper divisors (883663630).

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

646238450 is a wasteful number, since it uses less digits than its factorization.

646238450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 38.

The square root of 646238450 is about 25421.2204663742. The cubic root of 646238450 is about 864.5648963924.

The spelling of 646238450 in words is "six hundred forty-six million, two hundred thirty-eight thousand, four hundred fifty".